Mixed Flow Roof Fans (RMH) Motors protected to IP44 Motor insulation Class B Maximum operating temperature 4 C Standard Thermal Overload Protection IP65 service isolator Bird guard included as standard Speed controllable Performance tested to BS 848 parts 1 & 2 Manufacture controlled to BS EN ISO 91 2 Year Guarantee Specially designed for use when medium pressure characteristics are required, the Vent-Axia Mixed Flow Roof range is delivered on-site fully assembled and ready for installation. To meet COSHH requirements, a service isolator is fitted and pre-wired as standard. Equally suitable for flat or inclined roofs, the range is suitable for kerb or purlin box mounting and boasts a wide range of accessories to suit many different industrial applications. There are five sizes available with duties ranging from.66m 3 /s to 3.63m 3 /s (2182m 3 /h to 1368m 3 /h) with pressure development available up to 6 Pa. The mounting plate is moulded with a fixed integral bellmouth to ensure optimum efficiency and precise alignment. The weather-cowl is also moulded to produce a smooth, internal surface and a tough, stable UV resistant finish. Colour: BS 1A7. Alternative colours available on request. Vent-Axia mixed flow roof fans are designed for either kerb or inclined fixing (maximum angle 3 ). Electrical Single phase 22-24V 5 Hz. Capacitor start and run. Three phase 38-415V 5Hz. A service isolator switch is provided for local isolation and the enclosure is protected to IP65 according to BS EN 6529. All motors are fitted with Standard Thermal Overload Protection (S.T.O.P.), which for three phase fans should be wired into all controller circuits and into starter contactors. Most models are available with 4 and 6 pole motors. are designed to run at any angle. Insulation is Class B (from -3 C to +4 C). Manufacture is controlled to BS EN ISO 91 standards. Sound Levels Published db(a) figures are free field sound pressure levels at 3m with spherical propagation at a reference level of 2 x 1-5 Pa (2 micro- Pascal). The sound power level spectra figures are db with a reference level of 1-12 Watts (1 pico-watt). Performance Tested to BS 848 Parts 1 & 2. Accessories Purlin boxes Available in sizes to suit all models and should be used to support the fan in conjunction with a soaker flange sheet. Roof attenuators Available in all sizes to cover the range of Mixed Flow Roof fans in three lengths: 6, 9 or 12mm according to the attenuation required. Shutters Robust construction, designed to fit beneath the fan using the fittings provided. Airflow operated, manual or motorised shutter. A minimum distance of half the attenuator width is required between an airflow shutter and a roof attenuator for satisfactory operation. Motors The Mixed Flow roof range features a proven external rotor motor and backward curved mixed flow glass reinforced polyamide impeller selected for performance and non-overloading characteristics. The assembly is dynamically balanced to VDI 26. The motors in this range are rated IP44 according to BS EN 6529. Ball bearings are greased for life and 416
g Fan Dimensions (mm) Fan size a b c d Weight Kg 25 5 5 28 9 16 315 7 68 41 83 16 355 / 4 8 78 48 83 24/27 45 95 93 575 13 45 5 / 56 123 155 63 13 48 / 64 Details for Purlin Mounting (Manufactured from 1.5mm pre-galv. mild steel). Details for Kerb Mounting Max. roof pitch 3 Fan size a b c d e f g 315 625 9 24 765 4 653 4 355 / 4 725 9 24 865 5 753 5 45 89 7 25 99 65 878 65 5 / 56 13 75 25 114 76 128 79 Fan size a b c d e 25 5 5 28 9 16 315 7 68 41 83 16 355 / 4 5 7 57-83 45 65 85 69-13 5 / 56 79 99 842 1 13 417
Performance Curve Pa 8 25-56 dia - 4 Pole - 1 & 3 Phase 7 6 5 STATIC PRESSURE 4 3 15 16 47 2 14 1 1 12 13 15 3 45 6 75 9 15 12 135 15 m 3 /h Performance Guide.5 1 1.5 2 2.5 3 3.5 4 m 3 /s AIR VOLUME Phase Stock Curve m 3 /s at Pa Motor S.C. F.L.C. dba Dia. Model Ref Pole rpm Ref 5 1 15 2 25 3 35 4 kw Amps Amps @ 3m 25 1 RMH2512 2 272 1.25.23.21.19.17.15.13.11.9.16 2.1.7 62 315 1 RMH31514 4 14 2.49.44.38.31.21.17 1.4.8 52 355 1 RMH35514 4 141 3.87.77.65.51.33.31 4 1.45 56 4 1 RMH414 4 134 4 1.3 1.19 1.7.95.8.6.37.52 6 2.4 58 4 3 RMH434 4 134 4 1.3 1.19 1.7.95.8.6.37.54 4.2 1.5 58 45 1 RMH4514 4 138 5 2.5 1.92 1.77 1.62 1.45 1.26 1.5.82.57.96 1.5 4.7 64 45 3 RMH4534 4 138 5 2.5 1.92 1.77 1.62 1.45 1.26 1.5.82.57.89 5.9 1.65 64 5 1 RMH514 4 137 6 2.51 2.35 2.18 2.2 1.83 1.64 1.44 1.22.99 1.45 16 6.6 69 5 3 RMH534 4 137 6 2.51 2.18 2.2 1.83 1.64 1.44 1.22.99 1.35 1 2.4 69 56 3 RMH5634 4 138 7 3.63 3.46 3.31 3.13 3. 2.82 2.59 2.45 2.24 2.4 22 4.7 7 Sound Power Level Spectra db (re 1 12 Watts) Diameter Pole 63 125 25 5 1k 2k 4k 8k 25 2 69 75 8 78 76 74 73 66 315 4 64 75 77 7 6 63 63 51 355 4 65 68 75 73 73 7 59 53 4 4 66 73 79 77 73 72 68 61 45 4 71 76 84 83 83 8 77 65 5 4 73 82 87 84 84 82 76 68 56 4 75 83 9 87 85 85 82 73 418
Performance Curve 355-56 dia - 6 Pole - 1 & 3 Phase Pa 4 35 3 25 STATIC PRESSURE 2 15 43 4 45 1 5 1 42 1 2 3 4 5 6 7 8 9 1m 3 /h.25.5.75 1 1.25 1.5 1.75 2 2.2 5 2.5 m 3 /s AIR VOLUME Performance Guide Phase Stock Curve m 3 /s at Pa Motor S.C. F.L.C. dba Dia. Model Ref Pole rpm Ref 25 5 1 15 2 kw Amps Amps @ 3m 355 1 RMH35516 6 92 1.61.55.47.16.9 1.1.44 47 355 3 RMH35536 6 92 1.61.55.47.16.1.57.25 47 4 3 RMH436 6 91 2.92.86.79.59.2.39 1.4.67 49 45 1 RMH4516 6 92 3 1.42 1.35 1.29 1.7.73.15.4 5.1 2.3 55 45 3 RMH4536 6 92 3 1.42 1.35 1.29 1.7.73.15.59 2.96 55 5 1 RMH516 6 91 4 1.83 1.72 1.6 1.34 1.5.73.43 4.1 2.1 6 5 3 RMH536 6 91 4 1.83 1.72 1.6 1.34 1.5.73.88 4.4 1.45 6 56 1 RMH5616 6 87 5 2.56 2.43 2.32 2.7 1.82 1.54.68 7.1 3.3 61 56 3 RMH5636 6 87 5 2.56 2.43 2.32 2.7 1.82 1.54.67 4.1 1.55 61 Sound Power Level Spectra db (re 1 12 Watts) Diameter Pole 63 125 25 5 1k 2k 4k 8k 355 6 59 6 66 63 63 61 5 46 4 6 6 63 69 77 64 62 59 52 45 6 65 67 75 73 72 7 68 55 5 6 67 73 77 75 75 72 67 59 56 6 68 73 8 78 76 75 73 64 419
Accessories Dimensions (mm) Roof Attenuators kg Face Area Curve Stock Ref a b c d approx m 2 Ref 152315 395 495 445 6 18.156 12 1524 495 595 545 6 22.245 1 1525 645 745 695 6 31.416 1 15263 785 885 835 6 44.616 12 1521315 395 495 445 9 21.156 12 15214 495 595 545 9 28.245 1 15215 645 745 695 9 39.416 1 152163 785 885 835 9 52.616 12 1522315 395 495 445 12 25.156 12 15224 495 595 545 12 35.245 1 15225 645 745 695 12 48.416 1 152263 785 885 835 12 61.616 12 Pa 1 STATIC PRESSURE 9 8 7 6 5 4 3 2 1 1 42 1 2 3 4 5 6 7 8 9 1 MEAN DUCT VELOCITY m/s Roof Attenuator, Insertion Losses Stock Ref. Length mm 63 125 25 5 1k 2k 4k 8k 15 2 315 6 2 4 9 16 2 22 18 14 15 2 4 6 2 4 8 15 18 2 17 13 15 2 5 6 2 4 9 16 2 22 18 14 15 2 63 6 2 4 8 15 18 2 17 13 15 21 315 9 3 6 13 22 3 31 22 17 15 21 4 9 2 6 12 2 25 27 2 16 15 21 5 9 3 6 13 22 3 31 22 17 15 21 63 9 2 6 12 2 25 27 2 16 15 22 315 12 4 9 16 28 34 35 23 19 15 22 4 12 4 8 15 26 32 33 21 18 15 22 5 12 4 9 16 28 34 35 23 19 15 22 63 12 4 8 15 26 32 33 21 18 42
Accessories *edemand Controller Electronic Auto Voltage 1/3 Phase 3 Phase Fan Controller Transformer Starter Overload Control Inverter Inverter Stock Ref Stock Ref Stock Ref Stock Ref Stock Ref Stock Ref Stock Ref Stock Ref RMH2512 W13312M 131413 444744 444699 444164 - - RMH31514 W13312M 131413 444744 444699 444164 - - RMH35514 W13312M 131413 444744 44471 444164 - - RMH35516 W13312M 131413 444744 444698 444164 - - RMH35536-131431 444747 444697 444166 444177 444172 RMH414 13313 131413 444744 44472 444164 - - RMH434-131431 444747 4447 444166 444177 444172 RMH436-131431 444747 444699 444166 444177 444172 RMH4514 13316 131415 444744 44473 444164 - - RMH4534-131434 444747 44471 444166 444177 444172 RMH4516 13313 131413 444744 44472 444164 - - RMH4536-131431 444747 4447 444166 444177 444172 RMH514 13311 131417 444744 44472 444165 - - RMH534-131434 444747 44472 444166 444177 444173 RMH516 W13312M 131413 444744 44471 444164 - - RMH536-131434 444747 44471 444166 444177 444172 RMH5634-131437 444747 44473 444166-444173 RMH5616 13316 131415 444744 44472 444164 - - RMH5636-131434 444744 44472 444166 444177 444172 Roof Attenuators Purlin Air Operated Shutters 6mm 9mm 12mm Boxes Size Stock Ref Stock Ref Stock Ref Stock Ref Stock Ref 315 1517315 152315 1521315 1522315 1516315 355 1517315 152315 1521315 1522315 1516315 4 15174 1524A 15214 15224 15164 45 15174 1524A 15214 15224 15164 5-1525 15215 15225 15165 56-1525 15215 15225 15165 63-15263 152163 152263 151663 Air Operated Shutters and manual/motorisable Shutters are not suitable for use in combination with Roof Attenuators. Special manual/motorisable Shutters can be fitted to the bottom of the Roof Attenuator - Supplied by others * For full range of speed controller options, see Accessories & Controllers Section 421