For measuring duct leakage in residential & light commercial buildings.
Retrotec Model R31 consists of a Duc-Tester Module, a DM-2 Digital gauge and a 12 foot flex-duct with flanges for mounting on the return register. Case for DM-2A and grill mask dispenser not included.
New Home or Utility Standards
The Retrotec Duc-Tester is designed specifically to measure residential duct leakage. It can then be used to locate duct leaks and to measure the results of duct sealing. Use the Model R31 Duc-Tester to verify duct leakage for compliance with codes such as Title 24 in California. The typical 5 Ton air-conditioning system must have 120 cfm of leakage or less to pass California standards. The R31 will easily test any residential system because it will create 600 cfm which is 5 times more than that.
Retrotec Model R31 Specifications
Fan Flow (accuracy +/- 2.5 % with Retrotec DM-2 or Auto Correct software)
| Maximum Flow in Free Air: |
750 CFM |
353 l/s |
1273 m3/h |
| Maximum Flow at 25 Pascal with flex attached to a register: |
530 CFM |
250 l/s |
901 m3/h |
| Minimum Flow at 25 Pascal test pressure with flex attached: |
5 CFM |
2.36 l/s |
8.49 m3/h |
| Dimensions of Fan unit |
14 × 14 × 12 in (35 × 35 × 30 cm) |
| Fan Motor: EBM backward curved impeller. |
120V 2a or 240V 1a |
| Dimensions of Flex Duct |
10” diameter. 15” to 10’ in length. |
| Dimensions of Carrying Case |
25” × 14” × 15” |
Calibration meets: Canadian CGSB-149.1-2002 & SuperE, USA ASTM E 779 – 03, European EN 13829 & CEN, UK TM-23 Energy Standards. NFPA 2001- 01, ISO 14520 and fire standards.
Specifications subject to change without notice. Infiltrometer is a registered trademark of Retrotec. Two (2) years parts and labor on fan unit
Operation
The Duc-Tester will pressurize or depressurize a duct system (with the air handler off) from the main return grille (or blower access opening). The rest of the register openings are taped shut. Duct pressure is measured by static probes in the supply ducts. Airflow is determined by reading flow directly from the DM-2. No computer is required. Setup, taping the registers and getting results takes less than 20 minutes in most homes. The Duc-Tester can also be used in conjunction with a blower door to neutralize duct leaks to indoors to that only duct leakage to outdoors is measured.
