Find the vent that fits your opening
Three questions: where it goes, which way the air moves, and the size of the opening. Most people finish in under two minutes.
Already know the size or item number? Go straight to the full table1 Where does it go?
2 What happens at this opening when the system is running?
Turn the system on and hold a single ply of tissue about an inch from the opening. If it blows away, air is coming into the room. If it sticks to the face, air is being pulled out.
3 How big is the opening?
Measure the opening, not the old cover. Take the duct opening out to the inside edges, width first as you face it. The faceplate overlaps the hole, so the cover is always bigger than the size you order. See the full measuring guide
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the round duct behind it, not the face
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