please help air flow issues

[hvacguy1179]

I know when i have air flow issues by delta temps.
But proving it and fixing it is knoledge i lack.
Can anyone offer ways off measure cfm and or places to learn about it.
I have read sevral articals on the topic but i am just not getting it and the idea of cutting duct open every 20 ft and looking in with a flash light just doesnt appeal to me.

[airman1]

contact nationalcomfortinstitute.com to learn air flow

[bradjmx4]

air flow hood.

[dash]

Manometer and fan data sheets for the brand and model being tested.

[Jim Davis]

Delta T's can be fudged and still be misleading when they are correct. Unless you can measure airflow and Delta T it is a complete guess. Don't buy the tools until you invest in the training. Too many tools end up sitting around being unused because people are not sure what how to interpret the data they are collecting.

[Edited by Boss on 05-07-2004 at 09:29 AM]

[gate]

http://www.airflow.co.uk/

Has a nice How To Determine Airflow.PDF manual.

Check it out and see if it helps.

peace,
-Gate

[ranarous]

variable speed blower

[stickinit2thman]

I know when i have air flow issues by delta temps.
But proving it and fixing it is knoledge i lack.
Can anyone offer ways off measure cfm and or places to learn about it.
I have read sevral articals on the topic but i am just not getting it and the idea of cutting duct open every 20 ft and looking in with a flash light just doesnt appeal to me.

Although no tool can replace experiance and training or even sometimes reading then applying what youve read. But there is a tool that can help you not only measure the data you require but also help to determine a solution. The Fieldpiece hg2or3.It can do a rough calculation of airflow from inputs from up to 13 registers and will not only tell you the cfm but record and downloaded to computer for print out to customer.This along with reading and practicing may help alot.

[energy star]

Thread is eight years old.