I have been requested by UL-HongKong to the blocked 
ventillation abnormal testing with all vents on all side 
blocked simultaneously. My previous experience has been that 
one side is blocked at a time. Blocking more than one side at 
a time was considered multiple faults. If it passes blocking 
all vents at once shortens test time, but is this method 
necessary?

What is the experience of others?

Bob Johnson
ITE Safety


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