Measurement of front air velocities Standard EN 14175-4 § 5.4

Misura delle velocità d’aria frontali Norma EN 14175-4 § 5.4

PRINCIPLE OF THE TEST
The measure of the speed of the front floor of the up and down, after checking with the SMOKE TEST that the air flow is stable and homogeneous without leakage.

TEST METHOD
The up and down must be positioned in the specific conditions required or at an opening corresponding to the mechanical block (40-60 cm h).
Measurements of air speed at different points. The number of points depends on the size of the hood.
The measurement with the anemometric probe must be made inside the open top of the hood up and down.
The space behind the measurements must be free from any obstacle that could disturb the flow.
The duration of the readings must be at least 60 seconds on each point.
All environmental conditions such as: doors, windows, air compensation, flow rate occur.
No presence of people near the hood during the tests.
The measurements start after 5 minutes to stabilize the air flows.

RESULTS
Average of individual points and average of all points.

The measured value should serve as a reference for future periodic checks.

ELECTRIC TESTS
Tests according to EN 61010.

NOISE CONTROL
Measurement in dB of the noise of the suction system.

FRONT SPEED CONTROL

CONTROLLO VELOCITÀ FRONTALE

Control with anemometer certified on several points, depending on the size of the hood, the speed of the flow of air drawn into the laboratory.

NOISE CONTROL

CONTROLLO DELLA RUMOROSITA'

Measurement in dB of the noise of the suction system.