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Welcome to the Passive House Plus Forums.
There are currently 12 users online. 0 members and 12 guests
Most users ever online was 653, 11th July 2010 at 08:59 PM.
The most registrations in one day was 451, 28th September 2013.
Welcome to our newest member, johndunny
dont mean to sound like a smart arse but you def. don't want to spell optimum as you have spelt it.
best of luck