Combustion Venting Categories - Short #189

HVAC School - For Techs, By Techs

Bryan Orr

Training, Careers, Airconditioning, Self-improvement, Hvac, Business, Education, Refrigeration, Heating, Ac, Apprenticeship

4.8 • 985 Ratings

🗓️ 19 March 2024

⏱️ 8 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

In this short podcast episode, Bryan talks about the four different combustion venting categories for gas appliances as set by ASHRAE and where you'll see them. He also shares some notes about pressurization.

These categories deal with the pressurization and temperature ranges of the vents. Category 1 venting is used for old-school open-combustion gas furnaces; they have high flue gas temperatures and are considered low or mid-efficiency furnaces. This venting category is not positively pressurized, and it has a single-wall flue and operates more like chimneys, as the appliance is usually under negative pressure; a draft is created and draws the flue gas out. It's non-condensing, negative-pressure venting.

Category 2 venting is not common anymore; they operate with negative pressure in the vent, and condensation is still likely.

Category 3 venting is non-condensing positive-pressure venting. These are more common in older through-the-wall appliances.

Category 4 venting is condensing, positive-pressure venting for high-efficiency or condensing gas appliances with lower-temperature flues and sealed combustion. PVC is the most common venting material for these furnaces. We can recover some energy from the condensation process.

Learn more about the 5th Annual HVACR Training Symposium at https://hvacrschool.com/Symposium24.

If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE.”

Subscribe to our YouTube channel at https://www.youtube.com/@HVACS.

Check out our handy calculators HERE or on the HVAC School Mobile App (Google Play Store or App Store).

Transcript

Click on a timestamp to play from that location

0:00.0	Yeah, debadabidoo. It's the HVac School Podcast. I'm Brian. This is a short episode and we are going to talk about
0:09.9	venting categories for gas appliances. I was going to say gas furnaces because that's
0:15.0	mostly what I think about but it's all gas appliances. There are four different
0:19.0	categories and we're going to talk through them quickly but before we do that we're going to thank our great
0:23.4	sponsors carrier and carrier dot com I've been a carrier dealer for many years carrier
0:29.5	has their new green speed extreme super high efficiency heat pumps out on the market now.
0:35.1	Find out more by going to carrier.com.
0:38.7	Navac and Navac Global.com and the Break Free Power Tube Bender model NTB 7L.
0:48.0	Seriously, this thing is really great, bends even large-sized tubing up to 7-8s
0:52.3	OD. Find out more at truetech tools.
0:55.0	Come use the offer code to get schooled for a great discount at checkout. The
1:00.1	ESCO Institute and the HVACR Learning Network.
1:04.6	Our friends Howard and Jerry Weiss, Jason Objut,
1:07.3	Eugene Silverstein, Clifton Beck, all great guys
1:09.6	who are huge advocates for the industry are working hard to provide industry leading online content for HVACR professionals.
1:17.5	Visit HVACR. E- Learn. network to access reliable, up-to-date and relevant digital resources and even earn
1:26.8	continuing education hours. Enhance your knowledge today with HVACR
1:31.5	learning network from the ESCO Institute.
1:35.0	As always find out more by going to ESCOgroup.org. Refrigeration Technologies at Refrigerate.com and specifically the new Viper Wet
1:45.0	Reg Heat Shield, the revolutionary flame-resistant welding pad designed to be
1:50.9	used either wet or dry.
1:53.0	Find a Viper wet rag heat shield at a distributor near you or go to
	...

Please login to see the full transcript.

Previous episode | Next episode

Disclaimer: The podcast and artwork embedded on this page are from Bryan Orr, and are the property of its owner and not affiliated with or endorsed by Tapesearch.

Generated transcripts are the property of Bryan Orr and are distributed freely under the Fair Use doctrine. Transcripts generated by Tapesearch are not guaranteed to be accurate.