## NA7.17 Fume Hood Automatic Sash Closure System Acceptance Test

### NA7.17.1 Construction Inspection

Verify and document the following prior to functional testing:

(a) The fume hood sash zone presence sensor has a valid factory calibration certificate.

(b) Each fume hood sash obstruction sensor has a valid factory calibration certificate.

(c) Presence sensor has been located and adjusted to minimize false signals.

(d) Presence sensor pattern does not enter adjacent zones.

(e) Sash obstruction sensor has been installed per manufacturer instructions.

(f) Presence sensor has been installed per manufacturer instructions.

### NA7.17.2 Functional Testing

For each sash closure control system to be tested, perform the following:

(a) Test auto close operation. Verify and document the following:

1. Open the sash to maximum position or sash stop, whichever is lower.

2. Vacate zone presence sensor range to simulate unoccupied state and confirm that sash closes automatically to minimum, closed position within 5 minutes.

3. Verify that the presence sensor does not trigger a false signal from movement in an area adjacent to the space containing the controlled sash.

(b) Confirm that the manual controls are operational. Verify and document the following:

Open Test

1. If equipped, disable any auto open control mode.

2. Close sash to its minimum, closed position and confirm that it does not open automatically with triggering of the zone presence sensor.

3. If equipped, open the sash using a push button, foot pedal, or similar mechanism, confirming that the sash raises to the maximum position or sash stop. Otherwise, manually open the sash by hand.

Closed Test

1. If equipped, press the button that closes the sash and ensure that the sash closes to the minimum, closed height. Otherwise close by hand.

2. If equipped, while the sash is closing, trigger the stop button, verify the sash stops immediately when the stop button is activated.

(c) Confirm that the sash object detection controls are operational. Verify and document the following:

1. Open the sash to its maximum position or sash stop, whichever is lower.

2. Place a transparent object in the pathway of the sash and simulate an unoccupied state by vacating the zone presence sensor range. Verify that the sash does not close automatically on the object within the closing time delay setting (maximum of 5 minutes).

3. Open the sash to its maximum position or sash stop, whichever is lower, without any obstructions in the path of the sash.

4. Simulate an unoccupied state by vacating the zone presence sensor range. When the sash begins to automatically close, insert a transparent object into the path of the sash and verify that the sash stops before contacting the object.

(d) Confirm that net downward force is not more than 10 pounds when closing. Verify and document the following:

1. Disable object detection controls.

2. Place scale in sash opening of fume hood.

3. Close sash manually.

4. Sash closing force shall not exceed 10 pounds as measured by scale.

5. Repeat test with sash closing initiated by vacancy being detected by presence sensor.