We did some field work "in the day" on threshold effects (5 pa & 10pa) of exhaust rates and correlating those with ACPH50 values. The results of that work is now used in the HRAI Ventilation Manual as a predictive allowable…"
"It is a complex issue with many factors including the house and flue configuration, relative air-tightness floor to floor., presence of a flue-damper etc etc. I am not aware of where this is written up (Don Fugler may know). This is from personal…"
"@Brennan: With respect to your point about combustion back-draft, in cold weather, a depressurization event especially without combustion appliance operation can result in semi-permanent flue reversal. That is when the flue is cooled below house…"
"I agree. For modest homes a specialist is not likely to be engaged unless the Building Official flags it during construction. If it is done after the fact (conversion from wood to gas) then the only knowledgeable person who could stop it would be…"
"I agree that is a gap in combustion appliance certification testing. There is a logical disconnect between combustion appliance standards and ventilation/depressurization standards. Being the first on the block combustion appliance producers have…"
Yes, we are still doing depressurization testing. We use the CSA F326 test criteria. Now-a-days (as opposed to the '80's), new homes do not have spillage susceptible combustion appliances so we apply the 50 pa limit. As larger…"
"In Canada, return air in stud cavities is the normal practice, as are "lined" joist bays which serve as return air routes. There are some practices which have to be respected. But if the supply & return air system is completely within…"
"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…"
"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…"
"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…"
"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…"
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Welcome to Home Energy Pros Forum. 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!
Using our heat exchangers we can save 60-90% of your heating and hot water bills We supply heat exchangers for central heating, hot water, swimming pools, hot tubs, jacuzzis and dairy farms Unlike other systems this means NO extra electricity costs,…