How to properly remove floor register

Question

I am eliminating a floor register. What is the proper way to close this duct branch? Do I simply cap off the round duct work at the end or do I need to take off the complete branch (only register on this branch) and seal the opening at the main duct?

This is in a crawl space with easy access.

Thanks for any advice.

This is in a crawl space with easy access.

Thanks for any advice.

Brian Levredge · Answer

If it's a branch line off a bigger line, the whole branch should be removed.  The reason being is that air flow is being diverted from other rooms where it could be put to use.  If the HVAC installer was worth his salt, he installed dampers on the branch lines to increase/decrease air flow depending on how the system worked.  If there is a damper, all you need to do is close it, rather than remove the line.

Sam M. · Answer

If you capped off the end it would likely be the best. That way when you decide you need it after all (hey, sometimes it happens) it will not be a big deal to put is back. 
 Besides, if you cap the end it will not flow any air and be as if it didn't exist so no need to remove it.

Dave Barnard · Answer

You're much better off relocating the register as capping off this line in any fashion can cause other problems with the system. Ducting systems (when sized properly) are designed with a certain amount of static pressure. By capping off a duct you have essentially undersized the ducting system as a whole and increased static pressure because there is one less outlet. This may not be a noticeable problem to you, however this can cause many problems in the near future.

Just Don · Answer

do it right and take that duct off at the plenum and silicone and screw a tin lid over it.  leave the duct hang if you think anyone would want it there.

If its there,,why not let it be? OR extend it to a wall register if its in the road where it is.

How to properly remove floor register

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