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CON 4 Conservation Vent Grille in black
Conservation Vent CON5IMG_8549IMG_8544Conservation Vent CON4Conservation Vent CON4 PrimedIMG_8613Conservation Vent CON5 PrimedIMG_8532Conservation VentHandmade in Englandrps_369_rgbNBS Plus Endorsement Stamp Purple 256DSCF0002IMG_4256IMG_8608

Conservation Vent Grille

From: £120

Exclusive to the Cast Iron Air Brick company and a huge success, now in it’s tenth year of production from our foundry in Oxfordshire, England.

Conservation ventilation grilles are ideal for listed buildings, bathrooms, cloakrooms, tumble dryer outlets and all outlets and inlets where either a 4″ (103mm) ducting, 5″ (125mm) or 6″ (150mm) ducting is used.

Choose the size of the Grille that is suitable for your requirements (check product specification table below for further details). Finished in a hard-wearing black gloss or in a red oxide primer ready for you to apply your own finish.

For larger orders we can supply conservation vents in any RAL colour, professionally primed with 3 part epoxy + 2 part gloss or matt top coat at an additional cost – please email item number, quantity and RAL number for a proforma cost for this.

We can also supply bare metal for customers to finish on site all to allow to rust for an industrial or contemporary look – to order these online simply purchase the red oxide primed version and stipulate in the comments box that you want them – “bare metal unprimed”

These can be used with a fly mesh which is supplied in oversize round discs and fits around the end of the spigot.

The external dimensions of the CON4 and CON5 are similar, the difference is the spigot on the back which is either 4″ or 5″ diameter respectively.

The CON6 is a completely new design for 2019 and is a substantially larger vent, nearly double the weight of the smaller 4 and 5 inch versions. It is ideal for extracting or supplying larger volumes of air and is especially suited for preiod properties and is a stunning feature on a wall.  Because of its weight (5KG) it is esepcially important that it is secured to the wall if it is above head height and therefore has 6mm rather than 5mm diameter securing holes to accept bigger securing screws.


Please download the specification sheet PDF for this product if you require external dimensions of the conservation vent, spigot diameters and location of the securing holes. You will find this information on the last page of the spec sheet.

Clear selection

Specification PDF Cast Iron Cowled Conservation Vent ciabCON2


Item Spigot Size (Inches) Spigot Size (mm) Weight (kg) Air Flow (mm2)
CON 4 4 103 2.5 7,200
CON 5 5 125 2.6 7,200
CON 6 6 148 5 11,100

Additional Information




Painted black, Red oxide primer