Is it safe to vent AC exhaust into a drop ceiling?
Routing an exhaust vent above ceiling tiles in older buildings risks disturbing asbestos particles and making the room hazardous. Additionally, standard tiles cannot support the weight of the vent on their own, forcing people to build reinforced frames or modify tubing to secure the setup.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1taping openings around the hose with painters tapeDid this help you?
- 2running the vent through the roofDid this help you?
- 3getting the ceiling tested for asbestosDid this help you?
- 4Using flexible tubing or an elbow to bridge the gap to the tile.Did this help you?
- 5Building a support frame so the weight of the vent does not rest solely on the fragile ceiling tile.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Found a AC vent above the ceiling tile in my grandma’s laundry move, the boot and vent are about 10 inches from the tile, do I remove the boot and the vent and add an elbow or flexible tubing down and just mount it directly to the tile?”source ↗
“I’m assuming I need to reinforce or make a frame to hold said vent instead of just the tile.”source ↗
Where this came up
People with this problem also raised
- 3How to fix an exposed HVAC duct after removing a drop ceiling
- 2Dryer vent blowing into crawl space
- 2How to vent a ceiling bathroom fan through a snowy roof
- 6How to run ductwork through a load-bearing wall without weakening it
- 2How to add a vent when you can't reach the stack
- 4How to ventilate an attic with no open soffits?