shallow floor register

This is in Lubbock TX and its well under the house - doesn't rain a lot here, so again, that may be old lady paranoia speaking. How much clearance do I need above a floor vent? Koschenz, Markus, and Viktor Dorer. It only takes a minute to sign up. In addition to the aesthetic issues of mold, rodent, or sewer gas smells, these, along with odorless gases such as carbon monoxide can be serious even potentially fatal. Not only are there the issues we've discussed in the article above, but where radon gas is a concern, the fact that the ducts are at negative air pressure when the HVAC system is running increases the risk of radon gas entry into the home. EG rock size and layering of fill material. quite clearly that the duct system has been wet. by Inspectapedia Com Moderator. Use Up and Down arrow keys to navigate search results. "Detection of voids in grouted ducts using the impact-echo method." Better still, see our recommended article Termites rely on wood-soil contact. Also, use replacement grilles with a wider frame to cover minor defects. Also I have visions of the rock sliding down that horizontal whatever-it-is over time and the cement on top subsiding, possibly that's just little old woman paranoia. There were not worrisome slab cracks, the slab upper surface is above grade, and there was no history of water entry coming up through the slab ducts into the building. That's a custom cut register to fit so close to the wall; you don't want a new one or you'll just have to do that again (which isn't fun). One home-improvement strategy that can increase the comfort of your home is passive ventilation. I can always tell when termites are back because of the smell. On 2020-03-31 by (mod) - Termites in slab HVAC ductwork. See details at SLAB DUCTWORK, I had been noticing ants in around the vents in my home so I removed them to vacuum them as I assumes they were dirty. Our photos just below demonstrate exploring the condition of an air duct in a concrete floor slab by inserting our camera (with wide angle lens) into the duct system through a floor register. I have read that entire article several times and have not found a passage or passages describing exactly how to do this. I don't have a problem abandoning the returns as I can raise the air handler and build a new plenum below and make returns that vent directly into the room. Rather than try to fill the entire in-slab duct, we used the combination of metal scraps and drywall to provide a backer for concrete (shown in photos above). [book], [25] Geoffrrey Tweedale, Magic Mineral to Killer Dust: Turner & Newall and the Asbestos Hazard, Oxford University Press, USA (May 24, 2001), ISBN-10: 0199243999 I prefer either using split systems or of course ducts that do not run in the slab but rather in walls and ceilings. If you encounter wires or other obstacles that cannot be moved, you may need to choose another location for the vent. We have no relationship with advertisers, products, or services discussed at this website. Standards are published for acceptable noise levels that depend on room use. As reported in Best Practices Guide to Residential Construction: The EPA and the U.S. Geological include fabric fibers and skin cells, often also including starch fragments and other organic debris. See details at AIR FILTERS for HVAC SYSTEMS. In addition, where the transite ducts have become softened by water entry or have suffered mechanical damage, there is a risk of increased level of airborne asbestos in the building served by the ductwork. Can a US citizen who's never lived in US vote in US? We've had quite a winter season with significant snow fall, we're getting older and don't want to keep pumping out water not including the health risk we've been exposed. "Normal" dust and debris we find inside of air ducts is dominated by fabric fibers, skin cells shed by human occupants, perhaps some food or starch granules, and if the ducts are made from fiberglass, fiberglass particles will be present. Photo of transite duct material shown above is provided courtesy of Thomas Hauswirth, a Connecticut home inspector. Our photos below illustrate very dirty, debris-laden HVAC air ducts. Very thin carpet can be cut to the dimensions of the sleeve-hole and secured to the floor when the rim of the register is screwed down. At best I feel like I would somehow have to manage to chip out that PVC pipe down to at least 18", after of course totally tearing out the closet so I could even get at it. When abandoned, in-slab ductwork of any material can usually be left in place. It's essential to understand return grilles rarely influence room air patterns regardless of the return grille's face velocity. Shrinkage is something a bit over a half inch per 100 feet which is tiny but combined with the smooth PVC walls I feel like chances are a plug like that in a PVC pipe would not be stable over time. Thank you for your time and we look forward to your reply, - S. & G. L. 3/13/2013. Local store prices may vary from those displayed. Price Range $0.00-$19.99 is not selectable, JR Products 2" x 10" Dampered Metal Floor Register, Brown, JR Products 4" x 10" Dampered Metal Floor Register, Brown, JR Products 4" x 8" Dampered Metal Floor Register, Brown, JR Products 4" x 8" Dampered Metal Floor Register, Black, JR Products 4" x 10" Dampered Metal Floor Register, Black, JR Products 2" x 10" Dampered Metal Floor Register, Black. To be a little clearer: The instructions you DO give are to fill a heating vent in the floor to a depth of 2" with concrete. So those are the three solutions I can see - #1 do it right and fill it in; #2 leave it as is but cover with wallboard; #3 put the grates back up and just continue to ignore it the same way it has been ignored for decades. A passive vent is placed in a wall or a floor, enhancing air flow without burdening fuel-powered ventilation systems. Transite Duct Asbestos Hazards: if used for air ducts transite pipe may be a an asbestos hazard, particularly where the ducts become softened by water exposure (such as air ducts located in floor slabs), potentially releasing asbestos fibers into the building air. These are large tubes that appear to go either through or under the slab. But if the blockage is only at one register, that sounds as if the problem could be close to the register itself. Then, envision the solutions each may provide for your projects. Carino, Nicholas J., and Mary Sansalone. 3 (1992). The air duct system in this building had been subject to periodic flooding, as illustrated in our second photo (below right). While some contractors offer an expensive concrete pumping option to fill entire runs of abandoned under-floor-slab ductwork, usually that's not necessary nor cost justified. Air Diffusion Council, [16] Manual DResidential Duct Systems Air Conditioning Contractors of America (ACCA), [17] HVAC Duct Construction StandardsMetal and Flexible (1995 ed.) If the 4 inch square is in one corner of the planned hole, the centered nail will be 2 inches from both edges of the corner. I invite you to spend an hour studying different register and grille data. There are no quarries anywhere near here so laying hands on rock and gravel is a problem. by mod) Years of accumulated organic and other debris (odors, IAQ complaints) combined with a modest radon gas concern to lead a prior owner to begin abandonment of this duct system.But he had left floor registers open to the building - failing to close them off (we fill with concrete) and inviting ongoing IAQ problems. Use this green technique to reduce kitchen humidity and warm the spare room now serving as a nursery, for example. We have had good success inspecting the condition of in-floor and in-slab HVAC ducts using a simple digital camera that can be placed or held into the duct to take a quick look where a person's head cannot possibly fit for inspection. Sections 2 and 3 are checklists with detailed discussions for clean-up or abatement in crawl spaces. ISBN-13: 978-0199243990, [26] J. Claydon,Control & Management of Asbestos in Buildings: System of Local Rules (HHSC Handbook), 1997, [27] George A. Peters, Sourcebook on Asbestos Diseases: Asbestos Control & Medical Treatment, 1991, [30] Steven Bliss served as editorial director and co-publisher of, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the, Best Practices Guide to Residential Construction, by Steven Bliss. What can be done to get rid the termites?? An additional and important indicator of a building HVAC duct design that makes use of in-slab air ducts is illustrated at our photo and is explained in more detail just below. https://inspectapedia.com/aircond/Ducts_in_Slabs.php#Abandon When referring to a mixed batch of grilles and registers, the term grilles can describe a combination of both. recommended, since this will tend to draw radon Can I just box around it - I am wallboarding over where the grills were mounted on the wall, it was all just open space and dirt back in there - or had I better do something more definitive about it (and if so, what)? Add 1/4 inch to each measurement, so that the sleeve will fit easily in the holes you cut, but the rims of the floor register and the ceiling vent remain outside the hole. Our in-slab air duct photo shows evidence of a history of floods in the duct system as well as rodents (the rodent poison). I then took out the register to spray paint it white and want to put it back in the opening, and reattach the baseboard. Naturally you won't see every inch of the duct this way and you could miss collapses or other in-slab duct problems. In the example home to which my photo (at left) pertains, no area of the original concrete slab was left with cracks or openings that made us worry about contaminants entering the building through the duct passage. We describe steps taken to repair or abandon in-slab air ducts. In order to see into the vent we had to rip out the whole furnace (which we did already see added photo. Connect and share knowledge within a single location that is structured and easy to search. I had the house painted shortly after purchase in the course of which we removed two ducts under this closet on the front wall in the hallway and on a side wall in the living room at floor level, to discover a lot of filth and a 15" PVC pipe that is all smashed up and about 3' deep. But as you'll read in the article above on this page, if your ductwork is in the slab we recommend that it be abandoned and sealed for several reasons you can read in the article. There was 30 years of dirt, dust, and dirty-dusty-cobwebs or something worse behind those grills and it seems dust and dusty odor is still hanging in the air since I tried to clean it out yesterday. Your inspection needs to include a survey of all of those points. However sealing for Radon, I'm thinking I'd like to put a high density plastic sheet or panel in the vent and then pour concrete over that rather than just using concrete, less permeable to gas. [21][22][23][24][25][26][27]. Journal of engineering mechanics 133, no. I can look in my ducts with my phone and see very large cracks, showing pea gravel where foundation was poured. John Wiley & Sons, 2000. Moderator reply; If #1 is really necessary any pointers on exactly how to do that would be great. At the risk of sounding uninformed, what can be done with respect to air-conditioning in the summer? We discuss and illustrate disconnected heating or air conditioning duct defects, at DUCT CONNECTIONS. Draw your customer's attention to existing grilles and note their condition. Placing any These websites usually have photos of various registers. What is the best way to close off underground vent in a concrete slab? How does JWST position itself to see and resolve an exact target? HVAC air ducts located inside concrete slab floors invite a surprisingly broad range of building problems that fall into two broad categories: functional troubles such as lack of air flow or collapsed ductwork, and environmental problems such as radon, odors, flooding, mold, insects, and where transite - cement asbestos - ductwork was used, asbestos particle contamination. Journal of Materials in Civil Engineering 15, no. Further, 5.5 pCi/L is a very low level, as the action level is just 4 pCi/L - I'm not sure that added and costly measures would be justified. Wondering if this in cement duct looks like it contains asbestos? I don't have the equipment or the money to try to fill with concrete a 15" diameter hole that is over 3' deep and then joins with a horizontal duct of unknown length and diameter. Besides the thermostat, registers and grilles are the only system components that your customers regularly see. But its not the same situation as described in that article. InspectAPedia.com provides building and environmental diagnostic and repair information. Derivation of the Indo-European lemma *brhtr brother. Cut carefully to the depth that lets you pry up the top layer of flooring with a screwdriver. Do you insert that only on the vents or the whole area? You cut a small hole in the ceiling to check that there are no electric wires or other obstacles to placing the register sleeve. Installing passive vents, sometimes called dead registers, can improve the distribution of warm or cool air from room to room and can also address accumulations of moisture. It seems like the existing duct gets in the way when the fins of the register are open, so it does not sit directly on the floor, but 1 inch or so above the floor. it should be seamless or sealed airtight with durable Mark the dimensions of the hole on the ceiling, enclosing the 4 x 4 square within those dimensions. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. Then the hard part: screw it down to the room side (may need a right angle drive, and pilot holes). Modest amounts of Cladosporium sp. BTW it was just the duct GRATES I took down when painting, any ducting was itself long gone. Drill a hole in the floor at each corner of the sleeve-hole. At one corner, make 4 nail holes in a row as close to each other as possible. Transite pipe, which contains significant percentage of asbestos fibers, was often used for heating ducts and on occasion heating [24] Kenneth F. Cherry, Asbestos: Engineering, Management and Control, Lewis Publishers, 1990. If that dimension is larger than the metal duct opening then that register will not work. @redlude97 True, but it would not look as clean, The shoulders of the notch would not have 90 degree cuts. I would consider that more troublesome and expensive step in buildings subject to rising flood waters but otherwise I'd take the simpler approach I've outlined. Seal ducts and air-handling units Where Radon Gas is Present. Studying this engineering data will lead you to custom-select registers to resolve air distribution problems your customers want you to fix.

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