Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-23-2008, 07:57 PM   #1
Newbie
 
Join Date: Mar 2008
Posts: 3
Rewards Points: 10
Default

Flex HAV Ducting & Firestop?


I have a room in my basement in which the HVAC ducting (3 different flexible lines) enters a bedroom into a soffit area. How do I add a "firestop" around where the flexible HVAC vent enters the room into the soffit area? Not sure how to handle this?

interfx is offline   Reply With Quote
Old 03-24-2008, 01:07 PM   #2
Mold!! Let's kill it!
 
Join Date: Feb 2008
Location: Central Pennsylvania
Posts: 2,849
Rewards Points: 2,012
Default

Flex HAV Ducting & Firestop?


Is the soffit part of the rated wall/ceiling assembly? Or is the soffit in place INSIDE of the wall you are trying to firestop and strictly in place to conceal the flex duct? Is this a single family residence? Has someone told you that you must firestop the duct penetrations? The only method that I'm aware of for firestopping non metalic flex duct is to transition it to a fire damper and then back to flex after you are through the rated wall. I'm not a residential code expert, but I haven't seen a code requiring fire stop on duct work used in a residence. If someone has seen it, I'd like more info.

Maintenance 6 is offline   Reply With Quote
Old 03-24-2008, 09:16 PM   #3
Newbie
 
Join Date: Mar 2008
Posts: 3
Rewards Points: 10
Default

Flex HAV Ducting & Firestop?


Quote:
Originally Posted by Maintenance 6 View Post
Is the soffit part of the rated wall/ceiling assembly? Or is the soffit in place INSIDE of the wall you are trying to firestop and strictly in place to conceal the flex duct? Is this a single family residence? Has someone told you that you must firestop the duct penetrations? The only method that I'm aware of for firestopping non metalic flex duct is to transition it to a fire damper and then back to flex after you are through the rated wall. I'm not a residential code expert, but I haven't seen a code requiring fire stop on duct work used in a residence. If someone has seen it, I'd like more info.
Part of the Wall/Ceiling
Suggested by the Inspector (although he wasn't sure, but thought I should it done by HAVC contractor)
Single Family Residence

He also suggested transitioning to a metallic section through the wall back to flex once it is in the soffit.

I was wondering I could just stuff rockwool around it, if that would work enough...
interfx is offline   Reply With Quote
Old 03-25-2008, 06:33 AM   #4
Mold!! Let's kill it!
 
Join Date: Feb 2008
Location: Central Pennsylvania
Posts: 2,849
Rewards Points: 2,012
Default

Flex HAV Ducting & Firestop?


If the soffit is part of the rated wall/ceiling assembly, then the flex duct is not penetrating the fire barrier. Unless I am missing something, where would you put the mineral wool? Can you post a picture? I've still never heard of firestopping ductwork in a single family dwelling.
Maintenance 6 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Bathroom Exhaust Fan Ducting drtpdee HVAC 1 03-03-2008 06:47 PM
Garage Sub-Panel Firestop Mthrboard Electrical 4 12-03-2007 03:50 PM
Water in Furnace Ducting sdoca HVAC 3 09-14-2007 06:54 AM
Connect metal duct to flex? tigerbalm2424 HVAC 3 03-12-2007 02:30 PM
Types of flex duct and support method wingam00 HVAC 1 06-04-2005 01:12 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.