How it works

Open fires that belch forth clouds of smoke and smuts, with disastrous results to decorations and furnishings — anthracite burning boilers and cookers that you dare not light in windy weather because of obnoxious fumes — pilot-flame controlled gas and oil boilers and room heaters that will not stay alight, or burn erratically in windy weather — all can be cured with the ‘O.H.’ Chimney Cowl or Pot, which convert downdraught into an updraught irrespective of the strength or direction of the wind. It is so remarkably successful and so completely reliable that should it fail to cure the downdraught in any chimney — however bad — we will refund the price of the Pot or Cowl if we are notified in writing and the product is returned to us within three months of supply. There could be no greater proof of its efficiency.

Any wind blowing up or down the two open-ended air shafts ‘A’ or ‘B’ is intensified where it passes the projections of the horizontal flue ‘C’, and so draws the smoke and fumes out from the chimney with the same action as the ordinary scent spray or carburettor. The main flue ‘D’ projects into the horizontal flue ‘C’, thus there are three ejectors acting simultaneously and drawing out the smoke and fumes, whether the wind blows up or down the air shafts. So powerful is this action that gusts of wind blowing through the air shafts produce an up-draught equal to about 30% of the velocity of the gusts. In normal weather, the ‘O.H.’ Cowl possessing four outlets to the atmosphere improves any sluggish updraught.

Only the genuine ‘O.H.’ Pot and Cowl has the exclusive design, which converts downdraught into an updraught — no matter how strong or gusty the wind may be. REFUSE IMITATIONS! Look for the registered trade mark.

The proprietors will accept no responsibility for damage caused to 'O.H.' Pots or Cowls by chimney fires, frost, faulty handling or erection, tempest, nor damage to property or injury to persons resulting therefrom including thermal shock damage to their pots erected on short flues serving wood burning appliances where the practice of boosting flue temperature to burn off flue deposits is carried out.