Questions and Answers for VENTS-US 8 in. Galvanized Back-Draft Damper with Rubber Seal

A:  The "top" arrow should not be on the top it should point towards the Sky; the rod in the middle needs to be vertical The Airflow arrow should match with your Airflow direction. Please contact customer service if further help is needed,

A:  No, both ends are 8"

A:  The backdraft damper is designed for use in temperatures from -22°F to180°

A:  The KOM 200 U opens at 25 cfm @ 0.05 and 50 cfm at 0.1 static pressure. Using the KOM -U series with a Range Hood System should not affect the damper’s performance. The range hood filter usually does a good job preventing the presence of grease and dirt in the ductwork or on the damper. Please contact customer service they will fully resolve this issue.

A:  Yes it can. I do recommend making sure you have enough cfm that it opens when vertical.

A:  The KOM backdraft damper is designed to be installed in a horizontal position where the swivel axis is in a vertical position.

A:  After doing some testing on it I found that it works best on a slight angle where the doors are up. The spring on it is just strong enough to keep it closed. I have a 700 cfm blower about 3 feet in front of the damper, bows wide open. I live in Wisconsin and with the cold winds this past winter, I had no issues with. Blocked all the cold air. I do know that a 200 cfm inline booster fan will barely blow it open. So, depending on your needs and what you have in front of it and considering you have the depth in your ceiling, yes it will work.

A:  Yes that’s what i did, air flow going up so when the return fan shuts off the spring allows the flaps to drop

A:  Yes it can be installed in the ceiling. It is designed to prevent backdraft in the ventilation system. So as long as it is being utilized for this purpose then you should be fine.

A:  Yes, it can be installed horizontally. There are labels on the unit indicating the correct position when used in a horizontal position.

A:  It can be installed horizontally as it has springs to close the dampers.

A:  QShop, it has 2-springs that will allow it to close when installed in the horizontal position. When closed it seats against a soft thin rubber gasket. if installed to the outside, you may want to consider installing a thin mesh screen to prevent unwanted guest.

A:  Product has only a small single spring which is to weak to close dampers without gravity assist.