Commercial Vent

Commercial Vent

• Engine Company Commercial Vent Training– Objectives• Understand why an inspection hole is important.• Understand the purpose of smoke indicator holes.• How to utilize the 5 cut center rafter cut method.

• This class is a basic overview to prepare for the hands on portion of this training.

Commercial Vent

• Engine Company Commercial Vent Training– Will utilize 1 saw.– Minimum of two personnel but three is preferred.• Officer (required)• Sawyer (required)• Lookout/Safety (optional but recommended)

Commercial Vent

• 5 Points of Inspection Hole– Determine the roof covering– Determine the roof decking– Determine the rafter direction– Determine conditions directly underneath– Establish the type of operations that will be

accomplished

Commercial Vent

• Inspection Hole– This is a triangular cut

with each side approximately 12”.

– The first cut is 45 degrees to an outside wall.

Commercial Vent

Inspection hole

Commercial Vent

• Smoke Indicator Hole– Determine smoke and

heat conditions underneath the vent team

– Assists in determining the location of heat hole

– Only large enough to fit handle of rubbish hook into

Commercial Vent

• 5 Cut Center Rafter Cut (5 Cut)– Simple to use and remember.– Identifies the structural members and allows for

the maximum size of opening between members for heat hole/strip cut

– The louvers do not fall into the ventilation opening.

Commercial Vent

• A single ventilation hole is a 5 cut.

• When several 5 cuts are put together they are considered “with construction” or “against construction”

“With Construction”

“Against Construction”

Commercial VentAgainst Construction

Commercial VentWith Construction

Commercial Vent

• Vertically ventilating a commercial roof can be a very complex task. Utilizing Truck Companies is recommended when roof operations are needed on commercial roofs.

• This training provides Engine Companies the knowledge and skills to vertically vent a commercial roof when no Truck resources are available or are delayed.

Commercial Vent

• Hands on training:– Chalk saw station– Rafter rolling, smoke indicator, and inspection hole

station.– Full start to finish evolutions that bring it all together.

• Questions? Contact:– Jason Konieczka Jason.Konieczka@TukwilaWA.gov– Ben Hayman Ben.Hayman@TukwilaWA.gov– Jimmy Webb Jwebb@kentfirerfa.org