"You guys have been really helpful. One more question if you have the time ...
If you are hanging horizontal (mostly horizontal) metal exhaust duct runs, is there a specification for the number or location of duct hangers?
"I use 5" worm gear clamps for 4" steel pipe takes a 5/16 nut driver, very easy to clean. I use a long sweep 4" 28 gage elbow and and use tin snips cut back 3/4' 6 lines then clamp between dryer and …"
"I agree with Dara's approach, I haven't used the Hart and Cooley QC clamp, nor have I fabricated my own, but I have had success with the Fantech FC Series Clamps.
The Fantech clamps have the advantage of a rubber liner…"
"The best connector would be what is called generically a "Draw-Band". The Hart & Cooley Catalogue call theirs the "QC" and it is shown on page 12 of their accessory catalogue (attached). Fantech also has these. These are…"
"I hear what you are all saying about dryer vents, and how screws there should be avoided (as long as there is some way to clean the duct). Let's move the discussion to kitchen exhaust fan vents. What I gather from this conversation is that the…"
"See my reply to Don Fugler earlier. Dryer ducts can usually be cleaned effectivly with a shop-vac and the right connector. The difficulty is getting access to the duct. This is why we recommend this product…"
"I often suggest pop-rivets as an alternative to sheet metal screws for both clothes dryer duct work and for gutters and downspouts, for similar reasons. The obvious downsides include the need to drill a hole in addition to installing a…"
"Good to hear you have clean dryer ducts Don.
The dryer duct issues that we run into are predominantly upper story dryers that are vented out through the roof. Installers use a roof-cap with a screen and the lint packs up inside the screen. This can…"
"I never checked that before. Checking now...
Section M1502.4.2 of the International Residential Code prohibits screws or other fasteners that protrude more the 1/8" into a clothes dryer duct. M1502 also requires manufacturer instructions to be…"
Thanks for that response. Because of your warning, I just went down to the basement and disassembled my 4 inch diameter metal dryer duct, joined with screws (and taped), and peered down it with a flashlight. It has probably been up for 10…"
DRYER VENT: screws bad idea, possibly prohibited by code.
METAL DUCT: must be screwed together or other mechanical connection S/Drive etc
FLEX for conditioned air or ventilation: Panduit strap is preferred mechanical connection.
"Static pressure drop through a straight length of pipe is a function of friction rate, and friction is largely a function of surface smoothness. Like metal ducts, PVC pipes have a relatively smooth surface.
Here's a friction loss calculator…"
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