Checking all my air vents in my house.

Checking all my air vents in my house.

PostBy: Joeski On: Fri Jul 13, 2012 2:45 pm

Hi all.

Can some one point me to a way to check that air is freely flowing out of all the heating and cooling vents in my home at the reccomended flow rates. Also what should the air flow be? Where would I find that kind of info. I have an oil forced air furnace and central air and will be installing a Reading Susquehanna stoker this summer and into the fall and want the warm air flowing everywhere as much as is in the specs of the system. I think I can use a Dywer manometer to measure air flow but not certain if I'm right.

Thank you.
Joeski
 
Stove/Furnace Make: Reading
Stove/Furnace Model: Susquehanna

Re: Checking all my air vents in my house.

PostBy: coaledsweat On: Fri Jul 13, 2012 7:18 pm

coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: Checking all my air vents in my house.

PostBy: 2001Sierra On: Fri Jul 13, 2012 9:23 pm

You can take a plastic bag that is a known volume, maybe with a wire hanger to control the opening. Place it over the vent and time how many seconds it takes to inflate and do the math to figure the volume per minute. The math at this time is not working for me, I can only hope someone else chimes in :oops:
2001Sierra
 
Hot Air Coal Stoker Stove: Keystoker 90 Chimney vent
Coal Size/Type: Rice
Other Heating: Buderus Oil Boiler 3115-34
Stove/Furnace Model: Keystoker 90 Chimney Vent


Re: Checking all my air vents in my house.

PostBy: Yanche On: Sat Jul 14, 2012 12:11 am

One of the major HVAC instrument companies is Fieldpiece. See:

http://www.fieldpiece.com/

The anemometer accessory is here:

http://www.fieldpiece.com/accessory-heads/aav3

I've got the complete instrument kit for HVAC and gas furnaces. The anemometer is used to balance the air flow in a heating or cooling duct system. Basically you measure the air flow at each register and balance the system by opening or closing adjusting vanes as needed.

Some high efficiency heat pumps use a control system that sequences heat to each room in turn. It's done by opening and closing the motorized duct dampers. The anemometer instrument is necessary to adjust the system.

As "coaledsweat" points out a manometer and a pitot tube can also make the measurements. It's more difficult to to use than the anemometer. If all you want to know is relative air flow just tape equal lengths of toilet paper to the various registers and just compare the deflections. Rule of thumb for residential A/C is 400 CFM per ton, 450 CFM for a heat pump. There are ways to calculate your existing heat flow by putting a heat pump system in the electric heat mode only. Then by measuring the electric power input and the temperature rise over time you can calculate air flow.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Checking all my air vents in my house.

PostBy: GrandpaWasaMiner On: Sat Dec 08, 2012 2:10 pm

I just started research for an anemometer. I'd prefer a wind vane version instead of a probe. Why? I'm not a scientist or HVAC expert. I'd just like to gauge CFM's as a product of intake or output at the registers within my home.

Can anyone recommend or comment on models available from Supco, General Tools, or Pacific Star... any others? Remember this investment is going live most of its life in a drawer, so I don't want to invest over $150.00 USD.

Anybody have one they are willing to part with?
GrandpaWasaMiner
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Mark II

Re: Checking all my air vents in my house.

PostBy: Yanche On: Sat Dec 08, 2012 11:27 pm

I have the Fieldpiece Air Velocity and Temperature Accessory for their multimeter. It's likely more costly than what you are looking for but it will give you an idea of what's available. The much larger devices, that capture all the air exiting a vent are much more expensive. They are used by commercial HVAC contractors to balance air distribution systems. For residential use the Fieldpiece works well enough.

See: http://fieldpiece.com/accessory-heads/aav3
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Checking all my air vents in my house.

PostBy: Airflow_Expert On: Wed Dec 26, 2012 3:28 pm

GrandpaWasMiner, This is the anemometer that I use in my business. http://www.instrumart.com/products/2540 ... h-humidity. It's slightly over $150.00 but it does a very good job. :)

To consistently obtain your airflow readings,
I recommend you set the anemometer to MS (Meters per Second) to take the airflow readings. It's more accurate the CFM with these devices. To take your readings, leave the diffuser on the supply, and cover up 50% of diffuser with a pieces of sheet metal or cardboard. Measure the airflow from the center of the remaining opening (normally the 5th rung). Switch to the other side and average the two out. 99.9% of the time they will be the same but it may be different due to the ductwork and the way the airflow is acting coming to the diffuser. This will give you a start to determine the airflow coming into your rooms. Without divulging any copyrighted materials, I'm not in the position to provide the overall process and formula to permanently correct your temperature imbalance.

BalanceMyHouse.com
Airflow_Expert
 

Re: Checking all my air vents in my house.

PostBy: Lightning On: Wed Dec 26, 2012 5:11 pm

Airflow_Expert wrote:This will give you a start to determine the airflow coming into your rooms. Without divulging any copyrighted materials, I'm not in the position to provide the overall process and formula to permanently correct your temperature imbalance.


I'm sure nobody will mind :D
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut/Stove Size Mix

Re: Checking all my air vents in my house.

PostBy: freetown fred On: Wed Dec 26, 2012 5:33 pm

I guess a stick of incense would be out of the question here. :clap: toothy
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Checking all my air vents in my house.

PostBy: Poconoeagle On: Wed Dec 26, 2012 7:58 pm

thats they way i like it Fred! 8-) helps with the stinky sock problem too! :)
Poconoeagle
 
Stove/Furnace Make: Buckwalter & Co. , EFM520
Stove/Furnace Model: No. 28 Glenwood 1880, Alaska

Re: Checking all my air vents in my house.

PostBy: Wood'nCoal On: Wed Dec 26, 2012 10:07 pm

I think Yanche's toilet paper idea would work just fine in most homes.
Wood'nCoal
 
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert