Brandon Whitmore Posted October 2, 2008 Report Share Posted October 2, 2008 Did a 2 story house today. The main floor return air grill was located in the ceiling at the NE end of the home, and it passed beneath the Master bathroom located upstairs at the E. end of the home. The furnace was located at the SE end of the home, so the return air ran directly beneath the whirlpool tub. I opened up the tub access hatch and instantly felt a whoosh of air pulling from the bathroom closet where the access door was located into the area beneath the tub. There was so much air pulling through that it was pulling dust and spider webs pretty well. I am assuming that the plumbing must run right through that return air location and was not air sealed at the penetration (must be a big opening too). I could not see anything-- the plumbing penetration was on the opposite side of the tub with no access. Anyone aware of any codes that would apply here? This is on an outside wall so it is pulling insulation fibers into the home... Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted October 2, 2008 Author Report Share Posted October 2, 2008 I guess I could apply M1602.2 #4, but that is streeeeetching it. Since the access doors are not sealed, some return air is being pulled from the closet I guess. Quote Link to comment Share on other sites More sharing options...
carle3 Posted October 2, 2008 Report Share Posted October 2, 2008 If there is electric in those location I would think sections that deal with draft stopping IRC 602.8 "Seal gaps around ducts and pipes @ floor and ceiling level penetrations." Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted October 2, 2008 Author Report Share Posted October 2, 2008 Thanks Carl, I like it...... Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted October 3, 2008 Report Share Posted October 3, 2008 Originally posted by Brandon Whitmore Did a 2 story house today. The main floor return air grill was located in the ceiling at the NE end of the home, and it passed beneath the Master bathroom located upstairs at the E. end of the home. The furnace was located at the SE end of the home, so the return air ran directly beneath the whirlpool tub. I opened up the tub access hatch and instantly felt a whoosh of air pulling from the bathroom closet where the access door was located into the area beneath the tub. There was so much air pulling through that it was pulling dust and spider webs pretty well. I am assuming that the plumbing must run right through that return air location and was not air sealed at the penetration (must be a big opening too). I could not see anything-- the plumbing penetration was on the opposite side of the tub with no access. Anyone aware of any codes that would apply here? This is on an outside wall so it is pulling insulation fibers into the home... If there was that much air being pulled through, it sounds as if they used a panned joist bay as the return air duct. If so, that's been a no no for several years. M1601.1.1, (6). - Jim Katen, Oregon Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted October 3, 2008 Author Report Share Posted October 3, 2008 They were......... but it was a 1989 home. Can't say I've ever seen anything quite like this. Nothing like inhaling insulation fibers when the system is running. Quote Link to comment Share on other sites More sharing options...
hausdok Posted October 3, 2008 Report Share Posted October 3, 2008 Originally posted by Brandon Whitmore They were......... but it was a 1989 home. Can't say I've ever seen anything quite like this. Nothing like inhaling insulation fibers when the system is running. So, in your world, the HVAC guys don't glue sound-deadening panels to the interior of the air plenums? ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
Chris Bernhardt Posted October 3, 2008 Report Share Posted October 3, 2008 sound-deadening panels What's that?[] Chris, Oregon Quote Link to comment Share on other sites More sharing options...
hausdok Posted October 3, 2008 Report Share Posted October 3, 2008 The next time you open a furnace, look up or down into the air plenums above and below the furnace to see if there are any black panels about an inch thick attached with glue or rivets to the inside face of the plenums. They have a smooth thin facing; want to guess what the rest of that 1-inch is made from? ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted October 3, 2008 Author Report Share Posted October 3, 2008 The next time you open a furnace, look up or down into the air plenums above and below the furnace to see if there are any black panels about an inch thick attached with glue or rivets to the inside face of the plenums. They have a smooth thin facing; want to guess what the rest of that 1-inch is made from? I have a hard time believing that the insulation fiber concern would be the same between a densely packed board material and loose packed fiberglass batt wall insulation material, but could be wrong........ Quote Link to comment Share on other sites More sharing options...
Phillip Posted October 3, 2008 Report Share Posted October 3, 2008 Originally posted by hausdok Originally posted by Brandon Whitmore They were......... but it was a 1989 home. Can't say I've ever seen anything quite like this. Nothing like inhaling insulation fibers when the system is running. So, in your world, the HVAC guys don't glue sound-deadening panels to the interior of the air plenums? ONE TEAM - ONE FIGHT!!! Mike When I was installing ductwork; we only installed the sound dampers in commercial jobs. (schools and hospitals) Not in most homes. I have panned out a few joist in my time. As I see it any opening in the return that letting air in that not filtered needs to be sealed so the coil will not get stopped up from the items getting in. Quote Link to comment Share on other sites More sharing options...
hausdok Posted October 3, 2008 Report Share Posted October 3, 2008 Hi Brandon, No, I'm not talking about duct board I'm talking about 1-inch thick fiberglass batting with a thin hard face that is otherwise nothing more than a 1-inch thick batt. It's not any harder than the stuff in the walls and it shreds the same way. It's in a humongous percentage of systems up here. If it were so hazardous, I'd expect to see lines out the door at the hospitals. OT - Of!!! M. Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted October 4, 2008 Author Report Share Posted October 4, 2008 Aha, sorry Mike I definitely misunderstood........ Can't say I've ever seen the stuff. Quote Link to comment Share on other sites More sharing options...
johnmcda Posted October 4, 2008 Report Share Posted October 4, 2008 Originally posted by Jim Katen Originally posted by Brandon Whitmore Did a 2 story house today. The main floor return air grill was located in the ceiling at the NE end of the home, and it passed beneath the Master bathroom located upstairs at the E. end of the home. The furnace was located at the SE end of the home, so the return air ran directly beneath the whirlpool tub. I opened up the tub access hatch and instantly felt a whoosh of air pulling from the bathroom closet where the access door was located into the area beneath the tub. There was so much air pulling through that it was pulling dust and spider webs pretty well. I am assuming that the plumbing must run right through that return air location and was not air sealed at the penetration (must be a big opening too). I could not see anything-- the plumbing penetration was on the opposite side of the tub with no access. Anyone aware of any codes that would apply here? This is on an outside wall so it is pulling insulation fibers into the home... If there was that much air being pulled through, it sounds as if they used a panned joist bay as the return air duct. If so, that's been a no no for several years. M1601.1.1, (6). - Jim Katen, Oregon Jim, I believe M1601.1.1 prohibits only supply ducts in joist bays. Returns are allowed. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted October 4, 2008 Report Share Posted October 4, 2008 Originally posted by johnmcda Jim, I believe M1601.1.1 prohibits only supply ducts in joist bays. Returns are allowed. Only in existing buildings. All heated, cooled, supply or return distribution-air enclosures shall be ducted. Building framing cavities, closets, crawl spaces, and chases shall not be used as heated or cooled supply and return air enclosures. Ductwork may be housed or pass through these spaces. Exception: Building cavities used as return air ducts in existing buildings. - Jim Katen, Oregon Quote Link to comment Share on other sites More sharing options...
Phillip Posted October 4, 2008 Report Share Posted October 4, 2008 Originally posted by hausdok Hi Brandon, No, I'm not talking about duct board I'm talking about 1-inch thick fiberglass batting with a thin hard face that is otherwise nothing more than a 1-inch thick batt. It's not any harder than the stuff in the walls and it shreds the same way. It's in a humongous percentage of systems up here. If it were so hazardous, I'd expect to see lines out the door at the hospitals. OT - Of!!! M. I guess I miss under stood what you are talking about. It sounds like you are talking about the duct line that installed inside of the duct. It black on the top and fibers under the bottom and most of the time it is glued to the metal ductwork along with a few insulation nails to hold it in place. Quote Link to comment Share on other sites More sharing options...
hausdok Posted October 4, 2008 Report Share Posted October 4, 2008 Originally posted by Phillip Originally posted by hausdok Hi Brandon, No, I'm not talking about duct board I'm talking about 1-inch thick fiberglass batting with a thin hard face that is otherwise nothing more than a 1-inch thick batt. It's not any harder than the stuff in the walls and it shreds the same way. It's in a humongous percentage of systems up here. If it were so hazardous, I'd expect to see lines out the door at the hospitals. OT - Of!!! M. I guess I miss under stood what you are talking about. It sounds like you are talking about the duct line that installed inside of the duct. It black on the top and fibers under the bottom and most of the time it is glued to the metal ductwork along with a few insulation nails to hold it in place. Yep, Often damaged by a homeowner that's careless when replacing the filters. Never hear anyone complaining about it though. I remember one lady that claimed to have all sorts of allergies. I ended up doing 4-5 houses for her until she'd finally found one that she claimed didn't irritate her sinuses. That house had a bunch of this stuff inside the furnace plenum all damaged by an owner that was careless when replacing the filters. OT - OF!!! M. Quote Link to comment Share on other sites More sharing options...
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