Mixed Flow Roof Fans (RMH) Features and Benefits Motors protected to IP44 Motor insulation Class B Maximum operating temperature 4 C Standard Thermal Overload Protection IP65 P65 service isolator Guard included as standard All models 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. Motors The Mixed Flow roof range features a proven external rotor motor and backward curved mixed flow aluminium impeller assembly (355 dia. in polyamide) 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 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 Soaker Flanges The Vent-Axia range of soaker flanges are a simple and neat solution to weathering when a roof extract unit is required on a pitched corrugated roof. Colour: BS A 5. 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. 382 T: 844 856 591
Roof Fans Fan Dimensions (mm) Fan size a b c d Weight Kg 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 Kerb Mounting Max. roof pitch 3 g sq Fan size a b c d e Fan size a b c d e f g 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 79 355 / 4 5 7 57-83 45 65 85 69-13 5 / 56 79 99 842 1 13 W: www.vent-axia.com 383
Mixed Flow Roof Fans (RMH) Performance Curve Pa 8 355-56 dia - 4 Pole - 1 & 3 Phase 7 6 5 STATIC PRESSURE 4 3 13 14 45 2 12 1 1 15 3 45 6 75 9 15 12 135 15 m 3 /h.5 1 1.5 2 2.5 3 3.5 4 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 r.p.m. Ref. 25 5 1 15 2 25 3 35 4 kw Amps Amps @ 3m 355 1 RMH355-14 4 141 1.868.819.77.652.51.333.31 4 1.45 56 355 3 RMH355-34 4 141 1.868.819.77.652.51.333.25 1.55.5 56 4 1 RMH4-14 4 134 2 1.297 1.24 1.187 1.69.947.795.595.365.52 6 2.4 58 4 3 RMH4-34A 4 134 12 1.297 1.24 1.187 1.69.947.795.595.365.54 4.2 1.5 58 45 1 RMH45-14 4 138 3 2.53 1.986 1.916 1.77 1.618 1.451 1.256 1.45.82.57.96 1.5 4.7 64 45 3 RMH45-34A 4 138 13 2.53 1.986 1.916 1.77 1.618 1.451 1.256 1.45.82.57.89 5.9 1.65 64 5 1 RMH5-14 4 137 14 2.58 2.445 2.35 2.18 2.23 1.83 1.64 1.435 1.22.99 1.45 16 6.6 69 5 3 RMH5-34A 4 137 4 2.58 2.35 2.18 2.23 1.83 1.64 1.435 1.22.99 1.35 1 2.4 69 56 3 RMH56-34 4 138 5 3.631 3.541 3.458 3.35 3.13 3 2.817 2.589 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 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 73 384 T: 844 856 591
Roof Fans Performance Curve 355-56 dia - 6 Pole - 1 & 3 Phase Pa 4 35 3 STATIC PRESSURE 25 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 2.25 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 r.p.m. Ref. 25 5 1 15 2 kw Amps Amps @ 3m 355 1 RMH355-16 6 92 1.66.55.466.16.9 1.1.44 47 355 3 RMH355-36 6 92 1.66.55.466.16.1.57.25 47 4 1 RMH4-16 6 91 2.919.863.794.588.24.19 1.3.88 49 4 3 RMH4-36A 6 91 12.919.863.794.588.24.39 1.4.67 49 45 1 RMH45-16 6 92 3 1.417 1.35 1.288 1.67.728.149.4 5.1 2.3 55 45 3 RMH45-36A 6 92 13 1.417 1.35 1.288 1.67.728.149.59 2.96 55 5 1 RMH5-16 6 91 4 1.831 1.716 1.6 1.34 1.47.731.43 4.1 2.1 6 5 3 RMH5-36A 6 91 14 1.831 1.716 1.6 1.34 1.47.731.88 4.4 1.45 6 56 1 RMH56-16 6 87 5 2.556 2.425 2.324 2.74 1.821 1.541.68 7.1 3.3 61 56 3 RMH56-36 6 87 15 2.556 2.425 2.324 2.74 1.821 1.541.67 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 W: www.vent-axia.com 385
Mixed Flow Roof Fans (RMH) Accessories Dimensions (mm) Roof Attenuators Stock Kg Face Area Resistance Ref. No. a b c d approx m 2 curve 1524 495 595 545 6 22.245 B 1 1525 645 745 695 6 31.416 B 1 15263 785 885 835 6 44.616 R 2 15214 495 595 545 9 28.245 B 1 15215 645 745 695 9 39.416 B 1 152163 785 885 835 9 52.616 R 2 15224 495 595 545 12 35.245 B 1 15225 645 745 695 12 48.416 B 1 152263 785 885 835 12 61.616 R 2 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 386 T: 844 856 591
Roof Fans Accessories *edemand Controller Electronic Auto D.O.L. starter Air operated Roof attenuators Voltage 1/3 Phase 3 Phase controller transformer & Overload Shutters 6mm 9mm 12mm Purlin boxes Control Inverter Inverter Stock Ref. Stock Ref. Stock Ref. Stock Ref. Stock Ref. Stock Ref. Stock Ref. Stock Ref. Stock Ref. Stock Ref. Stock Ref. Stock Ref. RMH35514 W13312M 131413 444744 + 44471 15174 1524 15214 15224 15164 444164 - - RMH35534-131431 444744 + 444698 15174 1524 15214 15224 15164 444164 - - RMH414 13313A 131413 444747 + 444698 15174 1524 15214 15224 15164 444166 444177 444172 RMH434A - 131431 444747 + 444697 15174 1524 15214 15224 15164 444166 444177 444172 RMH4514 13316A 131415 444744 + 44472-1525 15215 15225 15165 444164 - - RMH4534A - 131434 444744 + 4447-1525 15215 15225 15165 444164 - - RMH514 13311A 131417 444747 + 4447-15263 152163 152263 151663 444166 444177 444172 RMH534A - 131434 444747 + 444698-15263 152163 152263 151663 444166 444177 444172 RMH5634-131437 444744 + 44473-15263 152163 152263 151663 444164 - - RMH35516 W13312M 131413 444744 + 44472 15174 1524 15214 15224 15164 444164 - - RMH35536-131431 444747 + 44471 15174 1524 15214 15224 15164 444166 444177 444172 RMH416 W13312M 131413 444747 + 444699 15174 1524 15214 15224 15164 444166 444177 444172 RMH436A - 131431 444744 + 44474 15174 1524 15214 15224 15164 444165 - - RMH4516 13313A 131413 444744 + 44471-1525 15215 15225 15165 444164 - - RMH4536A - 131431 444747 + 44472-1525 15215 15225 15165 444166 444177 444173 RMH516 W13312M 131413 444747 + 4447-15263 152163 152263 151663 444166 444177 444172 RMH536A - 131434 444744 + 44472-15263 152163 152263 151663 444164 - - RMH5616 13316A 131415 444747 + 44473-15263 152163 152263 151663 444167-444174 RMH5636-131434 444747 + 44471-15263 152163 152263 151663 444166 444177 444172 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 W: www.vent-axia.com 387