Multiflow Roof Units - MH / V Series


  • Multiflow Horizontal and Vertical discharge range of Roof units utilize an adjustable pitch mixed flow impeller, providing for a broad range of general ventilation applications.
  • There are 7 standard sizes from 315mm to 630mm diameter.
  • All units are suitable for operating temperatures of up to +50 °C.


  • The AMS range of roof units are precision manufactured from glass fibre re-enforced polyester resin giving a strong yet lightweight construction.
  • The cowls have been aerodynamically designed to produce the minimum possible resistance to airflow whilst offering full protection against the weather.
  • The impeller is a unique adjustable pitch mixed flow impeller with blade angles factory set to meet required duties.


  • Motors are metric pad mounted, with Class F insulation to BS4999 Part 101 and IEC 34-1, all weather proofed to IP55.

Electrical inputs

  • 220 -240V - 1Ph - 50Hz or 380 - 415 - 3Ph - 50 Hz

Soaker sheets

  • Soaker sheets are available in most modern roof profiles complete with integral upstands.

Selection procedure

  • The units are selected off standard Multiflow curves allowing a K factor of 1.25.


Model MH/V A B C D E F K L
315 710 500 660 400 80 640 650 510
350 710 500 660 420 80 640 650 510
400 710 500 660 440 80 640 650 510
450 810 600 760 460 80 740 810 575
500 810 600 760 480 80 740 810 575
560 960 730 900 620 100 880 1010 710
630 960 730 900 620 100 880 1010 710




Download AUTO CAD file
Download pdf file


The Multiflow TDE 500 to 710 range consist of fully cased, cylindrical models with circular mounting flanges at both ends and a wired terminal box.


The Mini Centrifugal Roof Fan series are the new type roof extract units available in 2 sizes and suitable for vertical and horizontal installation. The low noise external motor and high efficient backward bladed impeller meets the requirement of efficient ventilation in residential, commercial and light industrial applications.

Future 150

The Decor Series can be wall or ceiling mounted and is designed to exhaust stale and moist air from bathrooms, toilets, laundries etc. They are also suitable for ventilating all types of small or closed areas.

TD Silent

The Silent Series is a low profile mixed-flow in-line fan that produces low noise when in operation. It does this through a specifically designed perforated internal skin that directs sound waves produced inside the fan to a layer of sound absorbent material.


The low-profile TD-EVO 250 and 315 in-line mixed-flow fans for circular ducts have a unique design where the support bracket allows the motor and impeller assembly to be fitted or removed without dismantling the adjacent ducting.


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