Yeoman YMMB manual Pre-Installationchecks, Flue, Ventilation

PRE-INSTALLATION CHECKS

1. FLUE

Model

CL Milner Brick - STMB

		With or without flue liner system	mm	150min / 230max
		Round (diameter)	inch	6min / 9max
Flue/Chimney size
		Without flue liner system Square	mm	230 x 230
			inch	9 x 9
Flue/Chimney			m	4.5
(minimum height)		All products
			feet	13
	Do not connect to systems containing large voids or flues over 230mm (9") square

2. VENTILATION

2.1This appliance requires a constant supply of air to maintain proper combustion and effective flue performance.

2.2An inadequate air supply can result in poor combustion and smoke entering the room which is potentially dangerous.

2.3This supply of air can come from either:

—The natural leakage of air into the room in which the product is fitted.

—Purpose provided ventilation.

—Some Yeoman appliances can also be fitted with an optional outdoor air kit which allows air to be drawn in from the outside.

2.4The amount of air required must comply with local building regulations and the rules in force.

2.5If spillage is detected during commissioning then there may be insufficient natural ventilation and an additional air supply will be necessary.

2.6Many older buildings are sufficiently ventilated by natural leakage of air to provide suitable air supply for an appliance of 5kW output or less.

Modern building techniques have reduced the amount of air that leaks in or out of a house. A modern construction with an air tightness of less than 5m3 per hour per m2 requires an air vent for ALL solid fuel appliances including those with a rated heat output of less than 5kW.

NOTE: The air leakage of a modern house is tested at the completion of construction and a certificate issued confirming this.

2.7Ventilation requirements in the UK are as shown in the table below:

A) Traditionally Built Homes

•Where the leakage is greater than 5m3/hour/m2.

•Ventilation normally required = 550mm2 per kW output over 5kW

Output (kw)			4	5	6	7	8	9	10
		mm2	None	None	550	1100	1650	2200	2750
A	Additional	cm2	None	None	5.50	11.0	16.5	22.0	27.5
	ventilation
		in2	None	None	0.89	1.77	2.66	3.55	4.40

B) Modern Construction Homes

•Where the leakage is less than 5m3/hour/m2.

•Ventilation normally required = 550mm2 per kW

Output (kw)			4	5	6	7	8	9	10
		mm2	2200	2750	3300	3850	4400	4950	5500
B	Additional
		cm2	22.0	27.5	33.0	38.5	44.0	49.5	55.0
	ventilation
		in2	3.55	4.40	5.32	6.21	7.10	7.99	8.87

2.8Permanent air vents should be non-adjustable and positioned where they are unlikely to be become blocked.

2.9If vents open into adjoining rooms or spaces there must be an air vent of at least the same size direct to the outside.

2.10Site the vents where cold draught is unlikely to cause discomfort. This can be avoided by placing vents near ceilings or close to the appliance, see diagram.

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