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Heating, Cooling & Air Quality Categories
Best Choice YOPOWER 
Yopower Bladeless Fan, 2 In 1 Electric Tower Fan Heater Combo, All Season Air Circulator with 11 Wind Speeds, Remote& To 【Versatile 2-In-1 Bladeless Fan】Yopower multi-function tower fan for home combines the features of bladeless fan & towerYOPOWER 
YOPOWER 2 in 1 Evaporative Air Cooler & Heater Fan, Oscillating Tower Fan Electric Heaters, with 3.5L Water Tank, 12H Ti 【Convenient Operation】You are able to have the full control for easy and convenient control + Adjust settings from acros
HVAC Made Simple: A Beginner's Guide to Heating, Cooling, Air Quality, and Energ HVAC Made Simple. At The Nile, if you're looking for it, we've got it. We've got this. Country of Origin US. Audience GeBest Value Faryuan 
Bladeless Fan, 26.5Inch Heating & Cooling Combo Tower Fan 80° Oscillating, 9H Timer, 8 Speeds, Portable Quiet for Indoor 【Versatile 2-in-1 Design】: This Faryuan bladeless fan offers both heating and cooling modes, allowing you to enjoy comfo
Heating Cooling Doors Efficient Temperature Control Enhanced Air Quality The real color of the item may be slightly different from the pictures shown on website caused by many factors such as bFaryuan 
Tower Fan, 31.5Inch Cooling Bladeless Fan, Floor Fan Combo 80° Oscillating with Remote, 8H Timer, 8 Speeds for Indoor, B 【8 Speeds Cooling Wind】:All you need bladeless fan 1-8 speed Cooling mode,Paired with an 80 ° swing design, it can quickYOPOWER 
Yopower 3 in 1 Bladeless Tower Fan, Heater Cooler Fan with HEPA Filter Air Purification, 30° Manual Tilt, Remote Control 【Year-Round Comfort】This bladeless fan features 3-speed warm air (up to 35°C) and 8-speed natural wind mode, with 80° leHeating Cooling Doors X3 X4 Evaporator Comfortable Driving Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect m17% Off Dyson Dyson Pure Hot+Cool Link™ Purifying Fan Heater Captures gases and 99.95% of fine particles such as allergens and pollutants all while heating your home.1 For a warmer,Heating Cooling Doors Comfortable Driving Experience Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect mSereneLife SereneLife 7000 BTU Portable Air Conditioner and Heater, 4-in-1 Unit with Dehumidifier and Fan, WiFi Function, Mini AC U 4-IN-1 COOLING & HEATING FUNCTIONALITY – This versatile portable unit provides cooling, heating, dehumidifying, and fanBonaire Bonaire 3.5kW Portable Air Conditioner 12000 BTU with Heating & Cooling | WiFi App & Remote Control | Dehumidifier | Tou ★【 PORTABLE AIR CONDITIONER 】: Powerful 12,000 BTU (3.5 kW) cooling capacity, ideal for rooms up to 24 m². Quick DIY insHeating Cooling Doors Comfortable Driving Experience Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect mSpector Spector 3 in 1 Bladeless Cool Fan, Tower Fan & Heater Combo with HEPA Filter Airflow Purifying Fans Remote Control, Time 【Bladeless Fan Safety Design】- The Spector bladeless tower fan creates a steady, uninterrupted airflow without the needHeating Cooling Doors Efficient Temperature Control Enhanced Air Quality The real color of the item may be slightly different from the pictures shown on website caused by many factors such as b42% Off Evapolar Evapolar EV-500W evaCHILL Personal Evaporative Air Cooler and Humidifier, Portable Air Conditioner, Desktop Cooling Fan, Cooling 3in1: Evapolar evaChill mini AC cools & humidifies the air using evaporative technology, the cartridge materialHeating Cooling Doors X3 X4 Evaporator Comfortable Driving Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect mACA Trading Angelo 3 in 1 Bladeless Cool Fan, Tower Fan & Heater Combo with HEPA Filter Air Purification, Remote Control, Timer, Osc 👶【BLADELESS FAN SAFETY DESIGN】Angelo fans use patented Air Multiplier technology to create a smooth stream of uninterruHeating Cooling Doors X3 X4 Evaporator Comfortable Driving Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect mADVWIN Advwin 3 IN 1 Bladeless Cooler Heater Air Purifier Fan for Bedroom, with HEPA Air Purifier, 8-Cold/ 3-Hot Wind Speed, Re 【3-in-1 Cooler Heater & Air Purifier Fan】Stay comfortable all year round with this bladeless fan, heater, and air purifiFor 4 Series Heating Cooling Doors X3 X4 Evaporator Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect mCostway Costway 5-in-1 Portable Air Conditioner, 12000 BTU AC with Multi-Speed Fan & 24H Timer, APP & Remote Control & LED Displ 5-in-1 Multifunctional AC: This air conditioner perfectly combines the function of fan, dehumidifier, cooler AC, heaterHeating Cooling Doors X3 X4 Evaporator Comfortable Driving Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect mYOPOWER YOPOWER Portable Air Conditioner, 14000 BTU Room Air Conditioner with 4 Modes (Cooling/Heating/Dry/Fan), 24H Timer, 360° 【Powerful Cooling for Large Rooms】14,000 BTU cooling capacity delivers stable, rapid, and effective cooling for rooms upHeating Cooling Doors X3 X4 Evaporator Comfortable Driving Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect mCobuy Cobuy 2-in-1 Evaporative Air Cooler & Heater | 2200W Warm Air + 65W Cooling | 4 Wind Modes, 50° Oscillation, 12H Timer, ✅ 【All-Season Comfort】Stay comfortable all year round with both Warm Air Mode (1100W/2200W) and Cold Air Mode (65W). WheHeating Cooling Doors X3 X4 Evaporator Comfortable Driving Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect m35% Off HYUNDAI Hyundai Bladeless Purifier Fan with HEPA13 Filter - HYBLPFFANMA Advanced air purification.For 4 Series Heating Cooling Doors X3 X4 Evaporator Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect mAIR WING AIR WING Slim, Length & Angle Adjustable Air Conditioner Deflector helps Cooling/Heating Air Circulation, Anti Blast, Wi ☑️《DEFLECTOR SAVES ENERGY》 AIR WING MULTI deflector helps direct the air toward an area where it would be most beneficiaHeating Cooling Doors Comfortable Driving Experience Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect m17% Off AIR WING AIR WING Slim, Length & Angle Adjustable Air Conditioner Deflector helps Cooling/Heating Air Circulation, Anti Blast, Wi ☑️《DEFLECTOR SAVES ENERGY》 AIR WING MULTI deflector helps direct the air toward an area where it would be most beneficiaFor 4 Series Heating Cooling Doors X3 X4 Evaporator Enhanced Air Quality Compatibility: This evaporator is specifically designed to fit forBMW for 3 Series,for 4 Series,for X3,for X4, perfect mCOOLECH COOLECH 4-IN-1 Portable Air Conditioner, 3 Speeds & 2 Spray Modes, Boosting Mode, 900ML Tank, 25dB Portable Air Cooler,H 【𝟒 𝐈𝐍 𝟏 𝐂𝐨𝐨𝐥𝐢𝐧𝐠 𝐅𝐚𝐧, 𝐇𝐮𝐦𝐢𝐝𝐢𝐟𝐢𝐞𝐫, 𝐀𝐢𝐫 𝐂𝐨𝐨𝐥𝐞𝐫, 𝐍𝐢𝐠𝐡𝐭 𝐋𝐢𝐠𝐡𝐭】COOLECH 4-in-1 mini36% Off Philips Philips 1000i Series Air Purifier – 78 m² Coverage, 300 m³/h CADR, HEPA & Carbon Filter, Smart Sensor, Ultra-Quiet, Wi-F FAST AIR PURIFICATION – Cleans a 20 m² room in just 10 minutes; 300 m³/h CADR efficiently purifies spaces up to 78 m² ofJJLFresheners Atomization Film Air Humidifier Driver Board Mist Maker Fogger Ultrasonic Discs Circuit Ultra Power Low Fine Module Spra ULTRASONIC TECHNOLOGY: Advanced atomization film driver board creates fine mist using ultrasonic discs for effective humTbest Filter Cotton Sticks, 10Pcs Mini Portable Personal USB Humidifier Replacement 10 Packs Heating, Cooling & Air Quality Sp Advanced Porosity Structure for Enhanced Air Purification & Consistent Steam Output：This innovative foam filter featuresALFORDSON ALFORDSON 12000BTU Portable Air Conditioner Mobile AC Unit, White, 5-in-1 Cooling Fan Dehumidifier Heating with Sleep Mo VERSATILE FUNCTIONALITY: 5-in-1 portable air conditioner with cooling, fan, dehumidifier Heating and sleep modes, suitabCostway Costway 5-in-1 Portable Air Conditioner, 14000 BTU AC with Multi-Speed Fan & 24H Timer, APP & Remote Control & LED Dis 5-in-1 Multifunctional Air Conditioner: This air conditioner perfectly combines the functions of a fan, dehumidifier, co36% Off Shark Shark TurboBlade Ultra Powerful Bladeless Tower Fan, Powerful, Bladeless Fan, Limitless Customisation, Vertical & Horizo LIMITLESS CUSTOMISATION: Pivot fan from focused vertical Tower Mode to horizontal widespread Air Blanket Mode, twist venIndependently published Home HVAC Maintenance & Repair: The Complete Homeowner's Guide to Heating, Cooling and Air Quality Systems-Step-by-Step DUCTURBO DUCTURBO 6 Inch Inline Duct Fans, 350 CFM Ventilation Exhaust Fan Ideal for Indoor Heating Cooling Transfer Or Grow Tent COMPACT YET POWERFUL - This inline fan utilizes dual jet type blades to achieve high airflow of 594 M³/HR(350CFM). It moYYYV Heater and Cooler,Compact Air Warmer Heater Bladeless Desktop Cooler Fast Heating Cooling Fan Without Noise for Home Off Large slope turbine silent air duct, after inhaling the air, the turbocharger generates strong wind without noise.DUCTURBO DUCTURBO 4 Inch Inline Duct Fans, 160 CFM Ventilation Exhaust Fan Ideal for Indoor Heating Cooling Transfer Or Grow Tent COMPACT YET POWERFUL - This inline fan utilizes dual jet type blades to achieve high airflow of 160CFM. It moves A LOT oDUCTURBO DUCTURBO 8 Inch Inline Duct Fans, 710 CFM Ventilation Exhaust Fan Ideal for Indoor Heating Cooling Transfer Or Grow Tent COMPACT YET POWERFUL - This inline fan utilizes dual jet type blades to achieve high airflow of 1205 M³/HR(710CFM). It mJowxsx Jowxsx Atomization Film Air Humidifier Driver Board Mist Maker Fogger Ultrasonic Discs Circuit Ultra Power Low Fine Modu 1EconoHome Econohome Adjustable Thermostat Plug - Heating & Cooling Plug In Thermostat Compatible With Wall Mounted Room Heater, Wi Easy Operation - This home thermostat can control any heater or cooler in your home. After setting it to heat/cool mode,Uitndvyte Quiet operation pipe ventilation fan, improve indoor air quality, heating and cooling mixed air circulation This inline duct fan is a customizable solution for maintaining temperature and humidity levels in the target spaceADVWIN Advwin Portable Air Conditioner 9000BTU/2.65KW Dehumidifier & Cooling Fan, 4-in-1 Mobile Air Conditioner Air Cooler, LED ❄【4-in-1 Year-Round Comfort】Stay comfortable in every season with this versatile 4-in-1 portable air conditioner. CoolinIndependently published The Complete HVAC Guide for Homeowners: Heating, Cooling, and Air Quality Troubleshooting, Maintenance, and Money-Saving Antimbee Antimbee 2 Pack Adjustable Magnetic Heat & Air Vent Deflector -Super Strong Neodymium Magnets 8" to 15" Length Fits Vent Adjustable Vent Deflector: The air vent deflector is adjustable to adapt to various applications as vents, sidewall, ceiMidea Midea Portable Air Conditioner/Air Cooler with 4.8L Tank, 3-in-1 Portable Cooling Tower Fan, Humidifier & Auto-Swing, 3- 3-in-1 Evaporative Cooling & Humidification: Transform your space instantly! This Midea air cooler combines a powerful fHVAC for Beginners Handbook: The Complete Homeowner’s Guide to Heating, Cooling, and Air Conditioning — Save Money, Boos HVAC for Beginners Handbook: The Complete Homeowner’s Guide to Heating, Cooling, and Air Conditioning — Save Money, Boos AcbbMNS AcbbMNS 6-Inch 32.8FT Aluminum Foil Ducting Hose, Flexible Ducting HVAC Ventilation Air Hose with 2pcs Clamps for Heatin 【Air Ducting Size】 6 inches (150mm) diameter, 32.8ft (10m) long, with 2 metal clamps.Independently published HVAC MADE SIMPLE: A Beginner’s Guide to Heating, Cooling, Air Quality, and Energy Efficiency for Every Home and Budget Spider Farmer Spider Farmer 4 Inch Inline Fan Carbon Filter Ducting Kit, Exhaust Fan with Temperature Humidity Controller Hydroponics 【PROGRAMMABLE INLINE FAN】Mixed flow design combined with a EC motor ensure truly energy efficient, with only 40 watts ofThe Homeowner's Guide to Heating, Cooling & Indoor Air Quality Uitndvyte Quiet operation pipe ventilation fan, improve indoor air quality, heating and cooling mixed air circulation This inline duct fan is a customizable solution for maintaining temperature and humidity levels in the target spaceIndependently published The Complete HVAC Guide for Homeowners: Heating, Cooling, and Air Quality Troubleshooting, Maintenance, and Money-Saving EF ECOFLOW EF ECOFLOW WAVE 3 Portable Air Conditioner, 1800W/6100 BTU Cooling and 2000W/6800 BTU Heating, 1000W Fast Charging in 75 HyperSpeed Climate Control: 1800W cooling (20% more BTU than competitors) drops 15°F in 15mins under extreme heat. 2000WSKYLUXE SKYLUXE - USB Portable Air Conditioner – Mini Air Cooler with 3-Speed Fan, LED Light, and Humidifier Function for Person 3-Speed Fan Control: Customize your cooling experience with three fan speeds – low, medium, and high.ACA Trading ACA Trading Bladeless Oscillation Tilt Fan Cool Hot Air Purification Timer Remote Control, 2000W Ceramic Heater Tower Fa ✅【Adjustable thermostat, energy-saving】: The space heater mode features an adjustable thermostat. 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Built-in high speed cooling fan to quicklyAcbbMNS AcbbMNS 8-Inch 32.8FT Aluminum Foil Ducting Hose, Flexible Ducting HVAC Ventilation Air Hose with 2pcs Clamps for Heatin 【Air Ducting Size】 8 inches (200mm) diameter, 32.8ft (10m) long, with 2 metal clamps.Baoblaze BAOBLADE Powerful 4inch Quiet Ducting Fan Inline Duct Fan Exhaust Blower Air Cooling Bathroom Kitchen Ventilation Metal Fixed bracket; high-quality chip stamping, fixed firmly.HELLER Heller 45cm Floor/Desk High Velocity Air Cooler Fan/Cooling/Circulator Chrome Heller 45cm Chrome High-Velocity Fan29% Off YESDEX YESDEX Portable Air Conditioner - Evaporative Air Cooler Desk Fan 1200ML Water Tank, 3 Speeds & Timer Personal Cooling F 【Powerful Cooling】The Portable Air Conditioner comes with a generous 1200ml water tank that allows continuous spray with25% Off Hon&Guan Hon&Guan Air Duct,4“ 16 FT Long, Black Flexible Ducting HVAC Ventilation Air Hose for Grow Tents, Dryer Rooms,Kitchen (4 Low Noise Silencer: designed to reduce noise from fans and carbon filter systems, can decrease the noise by up to 50%.20% Off APAAR APAAR 4-IN-1 Portable Air Conditioner, 3 Speeds Fan, 3 Spray Modes, Air Cooler, Cooling with Detachable Activated Carbon ❄️ 3-in-1 Cooling, Purifying & Humidifying – Combines a mini air cooler, air purifier, and humidifier in one device to hEosnow Eosnow Central Air Conditioning Thermostat with Multiple Working Modes, Adjustable Manual Line Volt Thermostat for Heati MULTIPLE WORKING MODES:Mechanical thermostat features multiple working modes with various wiring options available. YouEacam Eacam PTC Air Heater 12V 100W, Fast Heating, Long Life Service, with Mounting Holes, High Temperature Cable, Automatic R [Versatile] applications suitable for heating, humidifiers, air conditioners and other common appliances.Independently published HVAC for Beginners Handbook: The Complete Homeowner’s Guide to Heating, Cooling, and Air Conditioning — Save Money, Boos Spider Farmer Spider Farmer 2024 4 Inch Inline Duct Fan with Speed Controller, 205 CFM EC Motor Quiet Ventilation Exhaust Fan for Heat 【QUIET & POWERFUL】Mixed flow design combined with a EC motor that powers high-quality impellers makes this fan truly eneSpider Farmer Spider Farmer 6 Inch Inline Fan Carbon Filter Ducting Kit, Exhaust Fan with Temperature Humidity Controller Hydroponics 【PROGRAMMABLE INLINE FAN】Mixed flow design combined with a EC motor ensure truly energy efficient, with only 50 watts ofIndependently Published Heating and Cooling Secrets Your Contractor Doesn't Want You To Know: A Guide To Prevent You From Being Scammed AIMALL AIMALL Wall-Mounted Air Conditioner Wind Deflector – Adjustable Air Outlet Shield – Anti-Direct Blowing – Cooling and He Adjustable Airflow Control 🌬️: The AIMALL Air Conditioner Wind Deflector allows you to easily adjust the direction of tPLAFOPE PLAFOPE Air Conditioning for Car Supply Air Conditioner for Heating Cooling Quality Maintenance Car charger mter: can be used for adding to vehicle with highly working performance.NAMOARLY NAMOARLY Wall-Mounted Air Conditioner Deflector Protects Health and Enhances Cooling Heating Comfort Central air conditioning windshield--convenient design for easy installation compatible with different air conditioningAC INFINITY AC Infinity CLOUDLINE LITE A6, Quiet 6” Inline Duct Fan with Speed Controller, EC Motor - Ventilation Exhaust Fan for He Designed to quietly ventilate grow tents, exhaust odors, transfer heating/cooling to rooms, and cool AV closets.Hon&Guan Hon&Guan 6 Inch Inline Duct Fan with Variable Speed Controller Quiet Energy Saving EC Motor Ventilation Exhaust Fan for Effective Ventilation: Hon&Guan HF-PE series 150mm channel fan with a fan speed of 2250 RPM and airflow of 530 m3/h moveVEVOR VEVOR 5 Inch Insulated Flexible Duct R-4.2，25 Feet Long with 2 Duct Clamps, Heavy-Duty Three Layer Protection Air Ductin Efficient Insulation: Enhance Comfort with High-Loft Glass Fiber Insulation, Quieting Operation and Reducing Heat TransfHG Power HG POWER 3 Inch Dryer Vent Hose, 16 Feet Long Flexible PVC Hose, Three Layer Noise Reducer Hose Aluminum Ducting for Hea HIGH QUALITY MATERIAL: The HG POWER pvc hose made of aluminum + PET and outer layer with PVC film; 3 inch.HG Power HG POWER 3 Inch Dryer Vent Hose, 16 Feet Long Flexible PVC Hose, Three Layer Noise Reducer Hose Aluminum Ducting for Hea HIGH QUALITY MATERIAL: The HG POWER pvc hose made of aluminum + PET and outer layer with PVC film; 3 inch.Gatuida Gatuida 2pcs Rv Exhaust Vent Replacement Vent for Camper Trailer Rv Ventilation for Camping Trailer for Heating Cooling Vent for rv-- durable material: made of stable materials, it is durable and can be used for a long time.Gbtdoface Gbtdoface Duct Connector Flange, Metal Vent Straight Pipe Flange Exhaust Hose Flange ABS Round Air Ducting for Heating C 【Universal wall flange fittings】: This product offers universal wall flange fittings for ventilation systems, providingSpider Farmer Spider Farmer 4 Inch Inline Fan Carbon Filter Ducting Kit, Exhaust Fan with Speed Controller Hydroponics Grow Tent Venti 【POWERFUL INLINE FAN】: Made of the heavy-duty plastic housing for superior durability, the hosing is dusting proof and wHon&Guan Hon&Guan 4 Inch Inline Duct Fan, 116CFM Ventilation Exhaust Fan for Kitchen, Bathroom, Heating Cooling Booster, Grow Ten Easy to Install: Plastic duct fan is lighter than steel. Removable duct ends with locking tabs for quick removal and easGeneric Ac Vent Deflector, AC Blowing Windshield, Adjustable Diverter Cover for Ceiling Registers Home Sidewall Heating Cooling Precise Airflow Control: Air Conditioner Vent Deflector optimizes the air supply path for balanced indoor temperature, iSpider Farmer Spider Farmer 4 Inch Inline Duct Fan with Speed Controller, 205 CFM EC Motor Quiet Ventilation Exhaust Fan for Heating C 【QUIET & POWERFUL】Mixed flow design combined with a EC motor that powers high-quality impellers makes this fan truly eneGbtdoface Gbtdoface Duct Connector Flange, Metal Vent Straight Pipe Flange Exhaust Hose Flange ABS Round Air Ducting for Heating C 【Universal wall flange fittings】: This product offers universal wall flange fittings for ventilation systems, providinguxcell uxcell 4" Duct Connector Flange, 2 Pack Dryer Vent Wall Plate Square to Round Straight with Clamp for Air Heating Coolin Color: Black; Material: ABS Plastic; Outer Diameter of Interface: 97mm / 3.82 inch; Fit for Ducting Hose with Inner DiamDOITOOL DOITOOL Tube Expander for Air Conditioning Refrigeration Repair Manual Flaring Tool Copper Material for Heating Cooling Steel tool--made of zinc-iron alloy material for and use,Flare toolOEMTOOLS OEMTOOLS 24444 Coolant System Refiller Kit, 5 Adapters, Eliminate Trapped Air, Test Radiator and Heating Core Lines for Efficient Cooling System Refill: The OEMTOOLS 24444 AirEvac Kit quickly refills your vehicle's cooling system while effeCRC Press Heating and Cooling of Buildings: Principles and Practice of Energy Efficient Design, Third Edition (Mechanical and Aero MARS HYDRO MARS HYDRO iFresh 4 Inch Smart Inline Duct Fan with Variable Speed Controller, APP Control, Temperature and Humidity Pro Smart Ventilation For Indoor Grows: Download the Mars Hydro APP to connect to the 4-inch inline duct fan and growers canACEDUROBLA ACEDUROBLA 2'' Duct Fan for Adjustable Speed, White Inline Ventilation Exhaust Fan, 22 CFM Duct Intake High Efficiency A 【TECHNICAL DATA】Our duct fan is supplied with a 2 inch diameter, 14700 rpm, power 6W, air volume: 36m3/h / 22 CFM, takeoAC INFINITY AC Infinity CLOUDLINE LITE A8, Quiet 8” Inline Duct Fan with Speed Controller - Ventilation Exhaust Fan for Heating Cool Designed to quietly ventilate grow tents, exhaust odors, transfer heating/cooling to rooms, and cool AV closets.Independently published HVAC Mastery for Homeowners: A Beginner-Friendly Guide to Thermostats, Air Filters, Heat Pumps, Furnace & AC Maintenance Vent Systems Vent Systems 4" Inch / 100 mm Round Air Vent Duct Connector Flange - White Plastic Air Supply, Exhaust Ducting Pipe Conn FITS 4" INCH / 100MM DUCTS: Duct connector flange with both male fittings, diameter of 3.90" inches / 99mm and flange inSpider Farmer Spider Farmer 6 Inch Inline Fan Carbon Filter Ducting Kit, Exhaust Fan with Speed Controller Hydroponics Grow Tent Venti 【POWERFUL INLINE FAN】Mixed flow design combined with a EC motor ensure truly energy efficient. 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