Modified Head Test Results
LOGO PLUS NAME AND ADDRESS

CASCADING THE DIFFERENCE PATTERNS AS A FUNCTION OF PERCENT BLOCKAGE SHOWS THAT BLOCKAGES ARE READILY DETECTABLE TO BELOW 25% BLOCKAGE OF THE LOCAL CROSS-SECTIONAL AREA OF THE PASSAGEWAY
Typical Response Pattern Location A2
EFFECT OF PARTIAL BLOCKAGE AT LOCATION A2
Typical Response Pattern Location B2 Typical Response Pattern Location C1