pakblogger2012
30-01-2014, 02:26 PM
May I request senior members to guide me regarding the standard method for measurement of CFM in hvac duct using Extech Instrument.
Please do include information and tips related to following questions.
Anemometer should be used in open mouth duct .with diffusers or without diffusers ?
Which size should we use for CFM ,diffuser size or upstream duct size,or neck size ?
If used at with diffuser,at how many positions and angle should we take readings? I have observed much difference in velocity at different locations of diffuser.
What should be position of return air damper for a room,should it be kept at fully open or partially closed position ?
How much error should we accept in CFM while commissioning an HVAC System? Please elaborate with relevant codes and standards.
How to verify the CFM and static of AHUs,?
Waiting for your kind urgent reply
Please do include information and tips related to following questions.
Anemometer should be used in open mouth duct .with diffusers or without diffusers ?
Which size should we use for CFM ,diffuser size or upstream duct size,or neck size ?
If used at with diffuser,at how many positions and angle should we take readings? I have observed much difference in velocity at different locations of diffuser.
What should be position of return air damper for a room,should it be kept at fully open or partially closed position ?
How much error should we accept in CFM while commissioning an HVAC System? Please elaborate with relevant codes and standards.
How to verify the CFM and static of AHUs,?
Waiting for your kind urgent reply