Inflow Velocity – Calculating Exhaust Flow (Alternative)
Description:
• Exhaust velocity measurements to determine inflow velocity.
Equipment:
• Thermal Anemometer, or equivalent (hotwire)
• Freestanding Fixture, or equivalent
Method:
1. Operate the unit in the work position for approximately 20 minutes.
2. Insert the anemometer probe into the probe stand, adjusting the height
to 4 inches (10 cm) above the exhaust filter.
3. Record the readings on a horizontal plane 4 inches (10cm) above the
effective exhaust filter area, in a grid pattern not to exceed 4 inches
(10 cm) x 4 inches (10 cm).
4. Average the readings and calculate the inflow velocity.
Grid Pattern:
•
4 ft Models 1584,1574
20 points
• 6ft Models 1589,1579
32 points
Effective Exhaust Filter Area:
• 4 ft Models 1584,1574
• 6ft Models 1589,1579: 16.8” x 34.8”, 4.06 sq ft
Inflow Area:
• 4ft Models (10” window opening work position) 1584,1574: Front opening
3.28 sq ft
8-6 1500 Series A2
Thermo Scientific
Section 8
Certification Testing
Testing Information
(continued)
3.94
2.98
2.98
2.98
3.94
3.94
3.74
3.74
3.74
3.74
3.94
inches
3.94
2.98
2.98
2.98
3.94
3.94
3.85
3.85
3.85
3.85
3.85
3.85
3.85
3.94
inches
