How to and useful info

Fan codes explained

There are usually 4 pieces of information found within a manufacturers code. For example: VSC45014 short cased axial flow extract fan.

The VSC part will be the fans model

This is usually followed by the fans blade diameter 450 (not the overall size of the case or plate)

Next is the Phase, 1. Fans will be either 1 or 3 phase

Last is the Pole of the Fan, 4. (Poles are always even numbers 2, 4, 6, or 8)

“A 4-pole motor is with 4 magnetic poles on the rotor and the number of related electro-magnetic windings (circuits.) A 4-pole motor has about 3.0 ft.-lbs of torque per horsepower where a 2-pole motor has 1.5 ft.-lbs of torque. At 60 Hz, a 4-pole motor is about 1800 rpm where a 2-pole motor is 3600 rpm”.

If you’re ever unsure about anything, JUST GIVE US A CALL!! We’re always happy to help and with over 20 years experience, no matter how big or small the job we’ll be able to guide you in the right direction.

How to select the right Fan

When selecting any fan the 1st thing to do is measure the room in meters.

The basic formula for working out the duty required is the rooms width x length x height x air changes for example: If your room is 5m x 5m x 2.6m x 10 (the average for a bathroom = 650 m3/h

You’ll then need to consider the resistance, known as pascals (PA). This can be tricky as multiple variations can effect the outcome. If you need help with this just give us a call and we’ll be happy to help.

Once you have this information you can start to look at which fan will be best suited to your needs.

Other things to consider then will be Cost, Design, and noise. As with anything in life, you get what you pay for!! but we offer a comprehensive range to suit all budgets and requirements so whatever you need we can find the right fan for you.

Bathroom Fan Zones explained

When selecting a Bathroom fan it’s important to consider where the fan will be installed.

There are Zones 0,1,2, which decide which fan is suitable for the job.

Bathroom Zone 0
The inside of the bath, or the inside of the shower that can physically hold or contain water. Electrical items installed into these areas must be low voltage, SELV (Safety Extra Low Voltage – no higher than 12V), and rated no lower than IPX7.

Bathroom Zone 1:
The area directly above zone 0, limited to a height of 2.25m above the bath or shower. Electrical items installed in this area must have an IP rating of IPX4 or higher. Items installed into zone 1 can be mains voltage, but if so must be fitted to a 30ma RCD. Low voltage items can also be installed in this area, but the transformer must be located outside of zone 2.

Bathroom Zone 2:
This is the zone beyond zones 0 and 1, continuing 0.6m horizontally and up to 2.25m vertically. As with zone 1, mains voltage items must be fitted to an RCD, and low voltage items’ transformers must be installed outside of zone 2. IPX4 or higher protection is required. Sink areas are classified as being in zone 2.

Bathroom Zone 3:
Any extractor fan can be installed in this area, as it does not have an IP rating. Apart from shavers and toothbrushes though, no electrical equipment is allowed in this area.

M1/150 N/C  - MiniVent Bathroom Fan + Overrun Timer - Helios
IP Ratings explained

First Digit: intrusion protection

  1. No special protection<
  2. Protection from a large part of the body such as a hand (but no protection from deliberate access); from solid objects greater than 50mm in diameter.
  3. Protection against fingers or other object not greater than 80mm in length and 12mm in diameter.
  4. Protection from entry by tools, wires etc, with a diameter of 2.5 mm or more.
  5. Protection against solid bodies larger than 1mm (eg fine tools/small etc).
  6. Protected against dust that may harm equipment.
  7. Totally dust tight.

The second digit – protection from liquids:
X0: no protection from liquids
X1: protection against vertically falling drops of water (e.g. condensation)
X2: protection against direct sprays of water up to 15 degrees from vertical
X3: protection against direct sprays of water up to 60 degrees from vertical
X4: protection against water sprayed from all directions – limited ingress permitted
X5: protected against low pressure jets of water from all directions – limited ingress permitted
X6: protected against high pressure jets of water (use on ship deck) – limited ingress permitted
X7: protected against the effects of immersion between 15cm and 1m
X8: protected against long periods of immersion under pressure

Volume Flow Rate Converter

The Volume Flow Rate Unit Conversion Calculator will give you a quick and accurate conversion for any inputted value. This will prove to be far more efficient than doing it as a manual exercise. Just add a value to either one of the units of volume and you will instantly be given all other conversion units.

Just click on the link below…Kindly supplied by our friends at Vent-Axia

Domestic Rooms

Air Changes

Shower Zone
15 – 20
Bathroom & Shower Rooms
15 – 20
6 – 10
2 – 4
Living & Other Domestic Rooms
4 – 6
10 – 20
Halls & Landings
4 – 6
Toilets – Domestic
6 – 10
Utility Rooms 
15 – 20
** Utility room a room equipped with appliances for washing and other domestic work. i.e. Washing Machines, Tumble Dryers, Sinks
Commercial Use
10 – 15
8 – 12
3 – 10
Changing Rooms with Showers
15 – 20
Conference Rooms
8 – 12
6 – 10
Hairdressing Salons
10 – 15
Hospital Wards
6 – 8
Laundries & Launderettes
10 – 15
Meeting Rooms
6 – 12
4 – 6
Restaurants & Bars
10 – 15
5 – 7
8 – 10
Sports Facilities
4 – 6
Store Rooms
3 – 6
6 – 10