Tuesday, February 07, 2012
What is an Air Circulation System?

Problem

Your living room is kept warm & comfortable with your current heater, but the warmth does not effectively penetrate into other parts of the house, particularly bedrooms off passageways. Alternatively, if the heaters can warm up other parts of the house, it is after a substantial period of time and the living room becomes uncomfortably hot.

Related concerns

You may be using portable or panel heaters in bedrooms or passageways, or alternative heaters used in separate lounge rooms, adding additional expense to the household. These only have limited effectiveness and, in combination, are more expensive than the primary heater.

Cause

Warm air, in general, does not like to naturally move away from your heater unless it is blown or caught in a cross-draught. Wood and gas heaters, in particular, naturally create a strong vacuum as the hot up-draught travels up the flue, which means that recently-heated air gets sucked away before it has a chance to be of any use. If you have a combustion heater of any kind, you will probably note that all draughts in your house are towards the heater, making it very difficult for warm air to move to other rooms in the house. As the warm air does not want to move away from the heater, most people then resort to closing doors to keep heat in specific rooms and cold rooms isolated.

Solution

A ducted air circulation system continuously moves air to and from the living room to the bedrooms, bathroom(s) and other living areas of the house. Warmed air will slowly travel around the house 10 to 15 times per hour, taking the chill off the walls, furnishings and even floors as it goes. An air inlet is placed in your ceiling near to the heater, which is connect to the other rooms via heavily insulated flexible ducting. A quiet, yet powerful, centrifugal air pump moves the air efficiently through the ducting. It is recommended that 4-5 rooms are ducting to at least, usually all bedrooms and the bathroom, so as to generate this “circulation effect”. Alternative systems that used weak fans, low-capacity ducting and incorrect positioning of the inlet and outlets are not able to capitalise on the circulation effect, which is where all the real benefits of the system are realised.

Expected outcomes

Less reliance on expensive panel heaters or other primary heaters, distribution of warmth to up to 8 rooms in the house, increase in the ambient temperature of the bedrooms and passageways by 4 to 8 degrees, a reduction in your heating-related bills by 15 to 50%, reduced window condensation, a drier environment with better air quality and a warmer living room. The living room is warmer because the warmest air (just below the ceiling) is “folded” back into the lower sections of the room by the subtle circulation effect.

Ducted Air Transfer System

Components of an Air Circulation System

Jet Diffuser

Used as an air inlet near your heater due to the large surface area for air, which helps minimise "air flow" noise. Also used on rooms that are over 2700mm high to enable the air to be pushed down into the room more effectively. From below, the homeowner can only see the front outer circle - the rest of the unit is hidden in the ceiling.

Jet Diffuser, often used as an inlet (large surface area for air) or outlet (for high ceilings)

Full Cone Nose Diffuser

These are the standard air outlets used in houses with standard 2400-2700mm ceiling heights. They distribute the air evenly around the room in a "parabolic" (umbrella) shape, and are subtle in appearance. The homeowner can only see the outer rim... the rest of the unit is hidden in the ceiling.

Fullcone Nose Diffuser, commonly used as an air outlet

Polyester-Insulated Ducting

This ducting is flexible in nature so that it can weave its way through roof obstacles. It has an inner-sheaf (foil-plastic laminate) over a strong wire skeleton, which is then surrounded by safe polyester insulation (which is used in teddy bears!) to maintain heat. This then has an outer protective layer of strong foil-plastic laminate. 

Insulated Flexible Ducting

Inline Air Pump (Centrifugal Fan)

The inline air pump shown is one of our smaller models, a high-revving 150mm positive-pressure centrifugal fan. Depending on your requirements, we supply models that can handle up to 500 Litres Per Second, although this is overkill for most domestic situations. These use very little power (120W on this version) and are designed for long-term use.
Warranty

Inline air pump, 150mm version shown

Home Efficiency Hotline: 1300 96 80 60

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