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Extending Ceiling Ducts - Drop Ceiling

 
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Old 02-13-2020, 04:20 PM   #1
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Extending Ceiling Ducts - Drop Ceiling


A suspended t-bar is going in, means the ducts and covers need to go lower.

Do they make extenders? I've heard they do but can't seem to locate.

Prefer not to drop the assembly on the upper tile for support (insulation between joist, copper running below one, etc).
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Old 02-13-2020, 04:26 PM   #2
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Re: Extending Ceiling Ducts - Drop Ceiling


The "extenders" you refer to are lengths of duct you cut to length.

Remove the boots, cut duct to length and re-install.

Support the extended boot w/guy wire to the framing.

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Old 02-13-2020, 04:35 PM   #3
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Re: Extending Ceiling Ducts - Drop Ceiling


Quote:
Originally Posted by griz View Post
The "extenders" you refer to are lengths of duct you cut to length.

Remove the boots, cut duct to length and re-install.

Support the extended boot w/guy wire to the framing.
I thought the boot outlet is same as standard duct size?

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Old 02-13-2020, 04:38 PM   #4
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Re: Extending Ceiling Ducts - Drop Ceiling


It's not uncommon for the final couple feet of duct to the diffuser to be flex duct.
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Old 02-13-2020, 08:50 PM   #5
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Re: Extending Ceiling Ducts - Drop Ceiling


Buy a straight boot/boots, 90 el/els and buy flex duxt/flexible duct connector. Remove boot. Put on 90 El. Run flex from El to New boot.
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Old 02-13-2020, 08:51 PM   #6
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Re: Extending Ceiling Ducts - Drop Ceiling


Take the 90 boot off, install an elbow and a straight boot.
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Old 02-13-2020, 08:56 PM   #7
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Re: Extending Ceiling Ducts - Drop Ceiling


Looks like bt beat me.

https://www.menards.com/main/heating...72-c-14260.htm


https://www.menards.com/main/heating...17-c-14260.htm
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Old 02-13-2020, 09:13 PM   #8
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Re: Extending Ceiling Ducts - Drop Ceiling


With the flex duct, what keeps the boot from falling?

Seems like I need a pair of metal rails on tile topside.
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Old 02-13-2020, 10:58 PM   #9
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Re: Extending Ceiling Ducts - Drop Ceiling


I'd put a rigid elbow on it and then rigid ducting to just above the ceiling tile level. Look for a 5 inch round diffuser which will just spring into the rigid ducting. Trying to keep a grill in the ceiling tile is a losing battle.
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Old 02-14-2020, 06:47 AM   #10
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Re: Extending Ceiling Ducts - Drop Ceiling


That would work too but you want 6” and one that closes for the summer.
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Old 02-15-2020, 07:56 AM   #11
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Re: Extending Ceiling Ducts - Drop Ceiling


Quote:
Originally Posted by artinall View Post
With the flex duct, what keeps the boot from falling?

Seems like I need a pair of metal rails on tile topside.
Duct ties keep the flex on the El, and the boot on the flex.

You can also make up rails for it if you prefer. Commonl done.
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Old 02-15-2020, 11:58 AM   #12
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Re: Extending Ceiling Ducts - Drop Ceiling


If there'e a third screw on that existing elbow (which there should be), you're going have to disassemble part or all of that run, to get access to that 3rd screw.
This may be more work than it appears. How many ducts are needed?
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Old 02-15-2020, 12:33 PM   #13
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Re: Extending Ceiling Ducts - Drop Ceiling


Quote:
Originally Posted by artinall View Post
With the flex duct, what keeps the boot from falling?

Seems like I need a pair of metal rails on tile topside.
The boot is on one side of the tile and the cover is screwed though from the other side sandwiching the tile. It doesn't weigh that much, Recess can assemblies and speakers both weigh more and are installed in ceiling tiles all the time without issue. Then, as stated above, flex run-out between the duct and the boot.
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Old 02-15-2020, 02:46 PM   #14
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Re: Extending Ceiling Ducts - Drop Ceiling


Quote:
Originally Posted by rescraft View Post
If there'e a third screw on that existing elbow (which there should be), you're going have to disassemble part or all of that run, to get access to that 3rd screw.
This may be more work than it appears. How many ducts are needed?
Know what you mean but feeling around up there, no 3rd screw was placed. - Finally, I benefit from someone's neglect!

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