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Thanks SAK9. As you have indicated we have tested our ductwork and achieved the leakage rates as per AS4254. The client has requested we have an overall leakage rate for room and ductwork under 1.0 L/s @ 200 Pa. The reason for this is Formaldehyde bombing of the room to prevent unwanted...

DouginMB: Australian Standard 1668 Part 1 allows for internal lining of kitchen exhaust ductwork if: # The material shall be deemed to be not combustible. # The materials shall have a temperature of fusion not less than 1000C # insu;ation materials shall have a temperature of fusion not less...

Has any one carried out a test on laboratory ductwork using pepperment oil to establish leakes? and what is the acceptable leakage allowance for a PC3 laboratory in Australia? Ductwork & Room?

If internal lining is used in kitchen exhaust ductwork. Can the internal lining be faced with a perforated foil? or is only perforated metal acceptable? If a pervious lining such as melinex is used to seal the lining, is the melinex to go over the perforated metal/foil or inbetween the...