Don Fugler
  • Ottawa, Ontario
  • Canada
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Don Fugler's Page

Latest Activity

Dara Bowser replied to Don Fugler's discussion joining ducts in the group HVAC
"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…"
Sunday
Don Fugler replied to Don Fugler's discussion joining ducts in the group HVAC
"David, If the IMC mandates metal dryer duct and prohibits metal screws, they must be accepting other fastening methods for metal ducts (unless the duct is continuous metal flex)."
Sunday
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"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…"
Sunday
Don Fugler replied to Don Fugler's discussion joining ducts in the group HVAC
"Brendan, 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…"
Sunday
Brendan Reid replied to Don Fugler's discussion joining ducts in the group HVAC
"Hi Don, Summary: 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. I…"
Sunday
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"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…"
Sunday
Sean Wiens replied to Don Fugler's discussion joining ducts in the group HVAC
"Apparently the air passing over the PVC creates a strong static field that in turn impedes air flow."
Sunday
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Why would you think PVC has high resistance?"
Sunday
Sean Wiens replied to Don Fugler's discussion joining ducts in the group HVAC
"Thanks David - I was going to look at PVC for the HRV but was cautioned against it, not because of the offgassing (which would not be relevant for dryer), but because the static build up leading to a high resistance to air flow."
Sunday
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Great post, Sean. I agree that screws are wise when joining metal ducts, but its also true that screws can be problematic in dryer exhaust ducts. For this reason, I used thin-walled drain & sewer PVC for my dryer exhaust in my previous home,…"
Saturday
Sean Wiens replied to Don Fugler's discussion joining ducts in the group HVAC
"Various studies have indicated very little air flow along surface of duct (for ventilation - have not studied forced air).  So if this is for venting, the screws would not be an issue at all as the pressures are to low.  This document…"
Saturday
Dara Bowser replied to Don Fugler's discussion joining ducts in the group HVAC
"Hi Don. We have never considered screws as impeding airflow, but I can see how in some ducts (e.g. dryer exhaust) they would catch lint etc. We always look for am minimum of two screws per joint in round duct. In cases where there are high solids…"
Saturday
Don Fugler added a discussion to the group HVAC
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joining ducts

A question came up on exhaust duct connections. I have always considered screws necessary for mechanical fastening of one duct to another. I have been reminded recently that screws impede airflow and catch particles and fibers, all of which is probably true. My source then said that, in their opinion, all ducts should be joined solely by either tape or mastic, or a combination of the two. Is this common practice? Does this increase the time of installation? Does it hold up over time, especially…See More
Nov 18
Don Fugler joined Allison A. Bailes III's group
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HVAC

HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part of home energy use, understanding HVAC is critical.See More
Nov 18

Profile Information

Company
Retired
Professional Certification
P. Eng.
Professional Interests
residential IAQ, energy usage, etc.

Comment Wall (3 comments)

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At 9:43am on February 24, 2017, Rana Belshe said…

Don,

I never got a link from you to the low cost particle monitoring group.  Or if I did I don't know where it arrived.  Thanks in Advance,  Rana

At 11:04am on November 15, 2016, Rana Belshe said…

Thanks, Don!

At 10:01am on May 27, 2012, Diane Chojnowski said…

Hi Don,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to upload your profile photo. And add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

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