Three Fan Systems : QMG Blower Door
Large and mid size building test kit. Carry the lightweight components under your arm and set up in minutes in any doorway. Ideal for TM23 testing UK standards up to 4,800 m2 floor area or for pressurizing large buildings for thermography. Heavy duty commercial 3 phase fans will run all day at any speed without over heating. The Variable Frequency Drive creates the 3-phase power but uses regular single phase wall outlet power; either 110 or 240 Volts!
Retrotec Model QMG consists of one DM-2A, one DM-2, three 3300 Fans and a Light weight hard door panel for 3 fans. Add fan cases, software, grill mask and accessory options.
One DM-2A measures and controls one fan automatically, a second DM-2A displays flow pressure for the other two fans. A third DM-2 could optionally be added so that each fan would display the flow for that particular fan.
Three 3300 Fans have 3 variable frequency drives that run on both 110 and 240 Volts. On 50 Hz other fans slow down to 4000 + cfm while this fan still puts out 8000 cfm! Built-in computer controls pressure or flow.
| Fan Flow (accuracy +/- 5%, +/- 3% with Retrotec software)* | CFM | m3/s | m3/h |
| Maximum Flow in Free Air for all 3 fans | 24,300 | 11.5 | 41,286 |
| Maximum Flow at 50 Pascal test pressure | 24,000 | 11.3 | 40,776 |
| At 50 Hz, NO power is lost due to variable frequency drive | 8,000 | 3.8 | 13,592 |
| Maximum Flow at 300 Pascal test pressure | 4,000 | 1.9 | 6,796 |
| Minimum Flow on Range Configuration C1 at 10 Pa | 38 | 0.018 | 65 |
| Dimensions | inches | cm |
| Fan Height | 26 | 66 |
| Fan Depth | 9.5 | 24.1 |
| Fan Inlet Diameter | 22 | 56 |
| Panel Height | 8.0 | 20.3 |
| Panel Width | 48 | 121.9 |
| Fan Weight | 37lb. | 16.8 kg. |
| Fan Input | Single phase,100 to 260 Volts, 2000 Watts | |
| Panel weight | 21.5 lb. | 9.8kg. |
| Fan Motors | 3 phase, 2.0 hp each | |
Calibration meets: Canadian CGSB-149.1-2002 & SuperE, USA ASTM E 779 – 03, European EN 13829 & CEN, UK TM-23 Energy Standards, Rain Penetration Standards. NFPA 2001- 01, ISO 14520 and UBC-905 fire standards.
QMG Blower Door Photographs
Retrotec's new DM-2A 3-fan splitter allows you to control and measure flow from all three fans with only two DM-2 digital gauges.
This diagram shows the tubing and connection arrangement for controlling 3- Model 3300 high-power fans with one DM-2A.