Good anemometer for HVAC
Whats a good anemometer to measure CFM from supply vents in a home. Im adjusting dampers, and want to see the difference in farther vents as I adjust, instead of just "it seems better" feeling with your hand
Feb 20th, 2021 10:17 am
Feb 20th, 2021 5:15 pm
quote=WikkiWikki post_id=34093495 time=1613834258 user_id=1374037]
Feb 20th, 2021 5:37 pm
Ouch, well for an average homeowner, what a good one for a reasonable $100 range or less?newlyborn wrote: ↑ Testo makes the best tools However it’s difficult to justify the cost as being home owner
Feb 20th, 2021 5:46 pm
Feb 20th, 2021 6:02 pm
Same here, thats why I was hoping an average home owner may of bought one and the results from itnewlyborn wrote: ↑ Plenty availble on Amazon under 100, however I have never heard of any of the brands
https://www.amazon.ca/s?k=anemometer&ad ... wxuh076z_e
Feb 20th, 2021 7:43 pm
Feb 20th, 2021 9:09 pm
Feb 21st, 2021 11:10 am
Thanks. Read that, and while I want to save a few bucks, because of my zoning system, I just want something I can use quickly and get actual numbers from.opendoor wrote: ↑ If you're just looking to balance the ducts, a garbage bag and a timer honestly works reasonably well:
http://publications.gc.ca/collections/c ... 09-eng.pdf
I've read you can reliably get within 10% of actual CFM using that method, and my experience matches that.
Feb 21st, 2021 4:06 pm
Feb 21st, 2021 5:43 pm
I dont care about heat loss. Ill do these tests winter and summer. I want to test what the airflow is, with even just the fan running. Why throw heat loss in there?insertname2020 wrote: ↑ I'm unsure of how much value the tool would be directly for balancing without knowing the heat loss of each room and how much airflow each needs.
It would be useful to determine total cfm going to the vents vs estimated system airflow based on temp rise test, and how it varies as dampers are adjusted, when just one zone is on. Can help determine if you have a major leak.
If you do buy one, look for something that allows you to enter the open area of the vents so it calculates airflow/cfm on the fly.
What an anemometer measures is velocity, not cfm.
This is one of the first on the page that can accept area (it has an area button): https://www.amazon.ca/30-HOLDPEAK-846A- ... ljaz10cnVl
I was looking into buying a multi-meter meter from holdpeak last year, emailed support and they actually answered my questions, which is a good sign. Have no idea if holdpeak is good quality though.
It is a chinese company but even if you buy american, the tools are all made in china anyway.
Feb 21st, 2021 7:21 pm
Feb 21st, 2021 7:30 pm
My target cfm would be this. All vents open, test. Adjust a vent on that zone, test again, Better than the feel by my handinsertname2020 wrote: ↑ The anemometer measures feet per minute; I mainly suggested was that if you get one, better one that can calculate cfm on the fly based on area automatically.
Yes, you can convert to cfm manually.
The anemometer can be very useful for what you want - to experiment and see what closing vents does. But you have no target cfm for each room.
I spoke about heat loss, because for balancing with this tool, you need to know the heat loss of each part of the house as a fraction of total.
This is to actually get the target cfm.
It's a pain and usually adjusting dampers, seeing how the room feels does the job