Can this be mounted horizontally?

Yes, I put it in a room AC vent, to outside, it wasnt at a 90 degree angle, appr a 45 anyway, nice product, spring loaded, working great for me

Can the 12" mount vertically? My application need is for my kitchen exhaust fan which exits into attic.

NOTE: by most state's codes; nothing should be openly venting into the attic. I can run through the attic, but needs to be vented outside. That said, the flapper is spring loaded and is opened by the force of the airflow created by your exhaust fan. I suspect it can be mounted vertically, just make sure the flappers are oriented so they open in the direction of airflow (upward) when the exhaust fan comes on. Hope this helps.

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ECOPRO VENT - " Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4")

ECOPRO VENT - " Inch Backdraft Damper for Straight or Flex Duct. Bathroom Exhaust Fan. Kitchen Hood Exhaust Fan and Different Dryer Fan Backflow Preventer. Steel Damper with Aluminum Valve Flaps (4")

Product ID: 347403558

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Details

Brand
ECOPRO VENT
Colour
white
Electric fan design
Exhaust Fan
Power source
Corded
Recommended uses for product
Cooling
Mounting type
Window Mount

⚡60W power efficiency

🔥Heat-resistant -22°F to 400°F

🛠️4-inch steel & aluminum build

Description

🌀 Stop backflow, start fresh airflow—upgrade your ventilation game!

COMPACT LIGHTWEIGHT - Only 159g with sleek white finish—blends into any modern setup
ALL SEASON PERFORMANCE - Operates flawlessly from freezing -22°F to scorching 400°F environments
SEAMLESS DIY INSTALLATION - Press-on design fits both flex & straight ducts for effortless setup
VERSATILE HVAC COMPATIBILITY - Ideal for bathroom, kitchen, dryer, and HVAC exhaust systems
ROBUST DUAL MATERIAL CONSTRUCTION - Durable steel body with lightweight aluminum valve flaps ensures longevity

The ECOPRO VENT 4-inch backdraft damper features a sturdy steel frame with aluminum valve flaps, designed for quick DIY installation on both flexible and straight ducts. Engineered for HVAC, bathroom, kitchen, and dryer exhaust systems, it withstands extreme temperatures from -22°F to 400°F, ensuring reliable airflow control indoors and outdoors.

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