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Air System—A compressed air supply, an exhaust system,or controllable blower is to be provided to develop therequired air pressure difference across the specimen. Thesystem shall maintain an essentially constant air pressuredifference for the required test period.NOTE 3—It is convenient to use a reversible blower or separate pressureand exhaust systems to provide the required air pressure difference so thatdifferent test specimens can be tested for the effect of positive pressure orthe effect of suction (negative pressure) without reversing the position ofthe test specimen. The use of the same specimen for both positive andnegative testing is outside the scope of this test method. If an adequate airsupply is available, a completely airtight seal need not be provided aroundthe perimeter of the test specimen and the mounting panel, although it ispreferable. However, substantial air leakage will require an air supply ofmuch greater capacity to maintain the required pressure differences.
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