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Based on what you are describing, it is probably a extra large PPV (Positive Pressure Ventilation) unit for larger buildings. The smaller ones are usually powered by Honda 5HP engines and use a wooden blade that is approximately 24 to 30 inches. I would imagine the Seattle trucks have them. Essentially, they place it at an opening at a low point (usually the front door of a residence or "Side A") making sure the airflow covers the entire opening or a "seal" over the door. Then they create an opening for an exit point on the opposite side and blow the smoke out. When the building is filled with smoke and you are trying to do mopup, they work quite well!

MVU was just called out for a fire in a little seafood restaurant below an apart met complex.
http://downtownseattle.komonews.com/node/242509


1/19/2010 6:50:50 AM F100005458 MVU1 308 4th Av S Fire in Building
1/19/2010 5:28:17 AM F100005458 PIO 308 4th Av S Fire in Building
1/19/2010 4:50:39 AM F100005458 A87 308 4th Av S Fire in Building
1/19/2010 4:47:44 AM F100005458 M44 308 4th Av S Fire in Building
1/19/2010 4:32:11 AM F100005458 M1 308 4th Av S Fire in Building
1/19/2010 4:24:26 AM F100005458 E17 L9 308 4th Av S Fire in Building
1/19/2010 4:22:46 AM F100005458 E13 L7 308 4th Av S Fire in Building
1/19/2010 4:18:53 AM F100005458 MAR5 308 4th Av S Fire in Building
1/19/2010 4:02:08 AM F100005458 A5 AIR9 B2 B5 DEP1E2 E25 E5 E6 L3 M10 SAFT2 STAF10
308 4th Av S Fire in Building
1/19/2010 3:58:41 AM F100005458 E10 L1 308 4th Av S Fire in Building

$250,000 fire at downtown Seattle building

The Associated Press

SEATTLE Investigators have determine that a fire at a downtown Seattle building was accidentally started by an electrical problem in a ground-floor restaurant.

Fire Department spokeswoman Dana Vander Houwen says damage is estimated at $250,000.

Two people suffered minor injuries in the fire about 4 a.m. Tuesday at the nine-story Downtowner Apartment building in Seattle's International District.

Fire Department spokeswoman Helen Fitzpatrick says one elderly resident with breathing trouble and a firefighter with a knee injury were taken to a hospital.

Firefighters confined the fire to the V Garden seafood restaurant.

Smoke in the upper stories forced many residents to wait in Metro buses while firefighters cleared the air.

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Jim N7UAP - Bellingham, WA / InterceptRadio.com