Test Hole Location for Static Pressure
Static pressure test holes must be located correctly for accurate readings.
What You Might Be Looking At
small hole in ductwork with rubber grommet or plug for pressure measurement
Apprentice words: test port, pressure tap, test hole, gauge hole
Trade terms: test hole, static pressure tap, pressure measurement port, Pitot tube location
Check First
What Not To Do
Don't drill near fittings, dampers, or transitions. Don't use oversized holes. Don't leave open after testing.
What can go wrong: Inaccurate pressure readings, incorrect balancing, system underperformance, TAB report rejection
Better Foreman Question
How far downstream of elbow should I drill? What hole size for Pitot tube?
Verify With
Reference type: SMACNA, ASHRAE
Source to verify: SMACNA HVAC Air Duct Leakage Test Manual, ASHRAE Guideline 11
Safe wording: Test hole location standards vary by test type. Verify against specific test procedure.