Hi Cazza…yes, always! Imagine it like this…if you had a Ferrari that goes 200mph you wouldn’t fit it with brakes that only work up to 70mph because that’s the speed Limit. You’d fit it with brakes capable of working at full speed. Same with ventilation and gas appliances. Most tests on appliances are carried out at full rate then you put the appliance back to its “as found” state. I hope that helps. Cheers
So when working out the ventilation for an appliance, is it the heat max rated input or output you use as the kw of the appliance to do your calculations with
hi drew brill videos thank you ,,i have the viper gas manual and the latest niceic books wichto be honest are pretty much the same as i used 5 years ago ,,but can i ask wher do i find that ready reckoner chart ? that you use in this video looks well handy ,,its definetly not in the viper manaul i got ,,Thank you
Hi Barry, great to hear from you. The ready reckoner you want in the Viper is on page f20 to f22 (in my version) The one I use in the video is from RD Treloar Gas Installation Technology, it’s a great book. Cheers and good luck with your relicence!
For example say you have 2 flueless appliances in a room, you’ve worked out the ventilation for both, tumbler dryer & a flueless water heater, the room volume is 9.6m3 & it’s a utility room, they each require 100cm2 squared of ventilation for combustion, so you’ve worked out 100cm2 for the tumble dryer, 100cm2 for the water heater, what I’m confused about is do u add the 2 calculations together so 100 X 2 = 200cm2 or because they both require 100cm2 each do you just go with the 100cm2, some info would be much appreciated, thanks
Hi Shredder .. the case above is a simple one .. neither of those appliances is a space heater so they both go into the “other” category. You add up the total CATEGORY requirement so in this case it’s 200cm2 and that’s what you provide as ventilation. I hope that helps..remember, it’s categories that count not individual appliances. Thanks for your question.
Hi, thanks for the question. If the fire is Open Flued and larger than 7kw then it is ID if there is no ventilation. I hope that answers your query. Thanks
