Face Velocity for Door Grilles
Face Velocity for Door Grilles
(OP)
Hello Friends
Are there any guidelines in National Building code or ASHRAE regarding maximum Face Velocity or free air velocity for air transfer grilles on doors/undercuts
Are there any guidelines in National Building code or ASHRAE regarding maximum Face Velocity or free air velocity for air transfer grilles on doors/undercuts





RE: Face Velocity for Door Grilles
RE: Face Velocity for Door Grilles
I was using 250 FPM but I need some valid document to justify my sizing on a project where consultant forgot to specify door grilles
RE: Face Velocity for Door Grilles
knowledge is power
RE: Face Velocity for Door Grilles
RE: Face Velocity for Door Grilles
Never seen a code or standard on this issue.
Good on ya,
Goober Dave
RE: Face Velocity for Door Grilles
RE: Face Velocity for Door Grilles
RE: Face Velocity for Door Grilles
RE: Face Velocity for Door Grilles
I know the TRANE ductulator says 200-300 fpm for both grille and door undercut as a rule of thumb but I tend to think 300 is too high (especially for door undercuts).
250 is my upper limit if I am trying to meet constraints on a project.
RE: Face Velocity for Door Grilles
Door grilles are seldom used nowadays for two reasons
1. If at hallways, then, they are a code violation nowadays, as door grilles are not fire rated, there may some rated doors with grilles, but it is your case?
2. transfer of room air to another, i.e use of a room as a return plenum is a code violation.
The question is: where and why a re you using door grilles to begin with?
you should use transfer ducts at ceiling with transfer grilles for toilet make-up air for example. if the wall is rated, you will need a fire damper at the TD. this is the general way things are done in the US, not door grilles.
RE: Face Velocity for Door Grilles