Stairwell Pressurization

Performance Test, Stair-shaft:

With the system operating and all doors closed, measure the stair­ shaft static pressure at three floors located in the top, center, and bottom thirds of the stair-shaft. This pressure is to be measured between the stair-shaft and hallway, at the floors selected, with the comfort air handling (HVAC) turned off.

EXCEPTION: Determine that the minimum pressure within the vestibule with the doors closed is 0.05-inch water gauge (12.44 PA) positive pressure relative to the fire floor and 0.05-inch water gauge (12.44 PA) negative pressure relative to the exit enclosure. No pressure difference is required relative to the exit enclosure.

Pressurized Stair-shaft System: Inspect the system for proper status prior to activating system. Activate any fire alarm initiating device to automatically activate the system. Inspect the status panel in the building fire control room/station for proper operation. Determine that the system has the minimum airflow requirement. This is done by multiplying a typical cross-sectional area in the stair-shaft in square feet by 50 linear feet per minute. With all doors closed using an approved anemometer at the exhaust point, determine that the system meets 90 percent of the minimum required CFM while maintaining a positive pressure.

Door Test: Test pressure is obtained by using an approved door-testing

Device applied in a direct vertical line above the axis of the door knob/lever.

Test 1: With the system on and all doors closed, the maximum allowable pressure that is required to open that door should be 30 lbs. That door must close and latch when released.

Test 2: With the system on and one other door open, the maximum allowable pressure to open the door shall be 15 lbs. Door must close and latch when released. In Tests 1 and 2, stair-shaft doors that swing outward must close and latch after being opened and released.

Test 3: With the system off, all doors in stair-shaft must close and latch after being opened and released.

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