Permanently Close and Seal Vent

[dgoldb1]

I am currently having my basement finished and there is a vent coming right off of the supply trunk. This area is going to have sheet rock install over top of it making it inaccessible. I thought it would be a good idea to seal this vent off totally since some air is getting through the closed vent grill. What is the best way to completely seal the hole where the vent was?

Thanks for the help.

[Shophound]

Your finished basement won't need any air from this supply location?

[dgoldb1]

Your finished basement won't need any air from this supply location?

No, I had two other ducts ran to other locations int he basement and the HVAC tech recommended that we only have these two because my unit can not handle the additional vents. So this one vent needs to be closed.

[RyanHughes]

Any HVAC professional who is familiar with sheet metal work should be able to do this without a problem. If there is a takeoff run for this supply, remove it. Then seal the hole in the trunk line with sheet metal and mastic. At least that's how I think it should be done. I'm not a pro; I'm just using common sense.

[dgoldb1]

Any HVAC professional who is familiar with sheet metal work should be able to do this without a problem. If there is a takeoff run for this supply, remove it. Then seal the hole in the trunk line with sheet metal and mastic. At least that's how I think it should be done. I'm not a pro; I'm just using common sense.

Could I just use duct tape to close the opening?

Maybe this type of tape?

[RyanHughes]

It might leak, and I don't like the idea of air running down a takeoff (if there is one connected to the main trunk line) just to go nowhere. What does your contractor suggest doing?

[dgoldb1]

It might leak, and I don't like the idea of air running down a takeoff (if there is one connected to the main trunk line) just to go nowhere. What does your contractor suggest doing?

He suggested sealing it up with tape and I told him I could take care of it.

[t527ed]

what happens 5 yrs from now when the tape dries up and falls off up inside a sheetrocked ceiling????????


i would do something a little more permanent, but i would NEVER sheetrock a basement ceiling in the first place!!!!!!

[dgoldb1]

what happens 5 yrs from now when the tape dries up and falls off up inside a sheetrocked ceiling????????


i would do something a little more permanent, but i would NEVER sheetrock a basement ceiling in the first place!!!!!!

I may end up dropping it down to the sheetrock ceiling and just closing the vent.

[Roden2]

The proper way to seal this duct is to locate it at the supply trunk and remove thay duct and seal with sheet metal and mastic if it is a sheet metal duct. If it is ductboard then remove the duct and seal with ductboard and mastic. Done correctly you will not have to worry about it in the future. In adding the other two ducts I hope they where properly sized! Done with duct tape only and you are asking for porblems in the future. Have a blessed new year!

[dgoldb1]

The proper way to seal this duct is to locate it at the supply trunk and remove thay duct and seal with sheet metal and mastic if it is a sheet metal duct. If it is ductboard then remove the duct and seal with ductboard and mastic. Done correctly you will not have to worry about it in the future. In adding the other two ducts I hope they where properly sized! Done with duct tape only and you are asking for porblems in the future. Have a blessed new year!

I think they were sized okay. There were already 2 ducts run along the basement ceiling that went to the upstairs living room and kitchen. He ran the same size duct off of the trunk to the two new rooms in the basement.

If I were to use sheet metal and mastic how would I size the metal? Seal it from the inside or outside?

Would this Mastic be ideal for sealing an old vent along with some sheet metal?

[Roden2]

Locate the duct to be removed, if it is a round take off, measure it buy a cap and a three screws to attach the cap and mastic the junction. If it is a square take off build a cap and do as above. Or maybe a better idea hire a professional to seal this duct and save time, worry and injury to your self. A professional will have all the tools and equip. to do the job quickly and correctly.

[dgoldb1]

I have posted some images...Please advise.