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TYPE WLL	Weather Louvre manufactured of extruded Type 50S anodising grade aluminium. The fixed horizontal blades are held in place by screws. Blades are spaced 35mm apart.

Standard Spacing	Top blade fits flush with frame. Lip of Bottom Blade overlap frame.
Accessories	WM	= Wire Mesh
	OBD	= Opposed Blade Damper NOTE: Adjustment from face of Louvre is not advisable.
	PC	= Punched Counter Sunk Holes
Dimensions	ON	= Normal Duct size
Notes	(1)	Alternative Meshes available on request
	(2)	For Weather Louvres smaller than 450 x 300 we recommend the use of Type RA with RASB Blade with19mm spacing.
Type WLL:		Weather Louvre
Vermin Protection:		= Plastic Bird mesh - Standard
		= Galvanised wire mesh
Frame Options	50mm	Standard
	30mm
Finishing Options	NA	= Natural Anodised
	EPC	= Epoxy Powder Coating

Note:

(1) Dimensions given are for opening size into which grille will fit

(2) If code "OS" is entered under SPECIAL INSTRUCTIONS, then dimensions given are over flange

Opposed Blade Damper - OBD






Determine the sound level which results from the combined effects of several sound sources is not as difficult as it is confusing.

The NV data for diffusers given contains an allowance for the sound absorbing properties of the average room and its contents. The Absorption is assumed to be 8db with sound power level referenced to 10Watts. (The absorption is 18db referenced to 10Watts) For relatively small spaces - about 76.2m2 or less floor area and ceiling height of 3.0m or less - the following simplified method for estimating NC levels produced by a combination of supply diffusers and return registers or grilles can be used

Determine the difference in NC level between the supply outlets or return intakes having the highest NC and the second highest NC level. From Table 9 determine the number of decibels to be added to the NV level of the unit having the highest NC level. This sum is the combined NC level generated by the two units. If three units serve the space, determine the difference between the combined NC level of the first two units and the NC level of the third unit. Determine the NC addition as above and add this to the combined NC level of the first two units.

If the difference between NC levels of two units is 10db or more, the sound generated by the quieter unit will not affect the space NC.

TYPE OBD	Opposed Blade Damper manufactured from extruded aluminium Blades. Blades are held in place by spring wire and star lock push on fix. The OBD blades are linked and lever or slot operated. OBD suits all standard grilles and diffusers.

Blade Options:		Standard as per sketch
Finish Options:	PR	= Primed Black (Optional)
	MF	= Mill finish (Standard)
Blade Spacings	25mm	Standard

Note:

(1) Dimensions given are for - To fit ON of mother grille

(2) If OBD to fit grille, indicate type of grille, outside neck size.

TYPE WL	Weather Louvre manufactured of extruded Type 50S are held in place by screws. Blades are spaced 50mm apart.

Standard Spacing	Top blade fits flush with frame. Lip of Bottom Blade overlap frame.

Accessories	WM	= Wire Mesh
	OBD	= Opposed Blade Damper NOTE: Adjustment from face of Louvre is not advisable.
	PC	= Punched Counter Sunk Holes
Dimensions	ON	= Normal Duct size
Notes	(1)	Alternative Meshes available on request
	(2)	For Weather Louvres smaller than 450 x 300 we recommend the use of Type RA with RARB Blade with19mm spacing.
Type WL:		Weather Louvre
Vermin Protection:		= Plastic Bird mesh - Standard
		= Galvanised wire mesh
Finishing Options	NA	= Natural Anodised
	EPC	= Epoxy Powder Coating

Note:

(1) Dimensions given are for ON size

(2) If code "OS" is entered under SPECIAL INSTRUCTIONS, then dimensions given are over flange

Custom made products
	Designed to complement architectural and interior/exterior designs. Fabricated aluminium flat sheets and aluminium extruded sections. Natural or colour anodised with epoxy powder coating or painted finish.