Features

• Complete Ventilation Saw Upgrade Kit: Converts compatible Stihl MS440 and larger chainsaws into fire and rescue ventilation saws.
• 20-Inch VentMaster COBALT Guide Bar: Designed for plunge cuts and maximum carbide chain performance.
• COBALT Alloy Inserts: Help protect against wear, galling, and impact damage.
• Precision-Milled Guide Groove: Improves cutting accuracy and chain tracking.
• Hardened Rails: Increases durability and service life.
• Sealed Nose Bearings: Fully integrated bearings provide smooth operation and reduced maintenance.
• Heavy-Duty Rim Sprocket: Self-cleaning design helps maintain performance in demanding environments.
• Raptor Carbide Chain Loop: Built specifically for fire and rescue cutting applications.
• Open Double-Raker Chain Design: Helps protect carbide cutters while improving cutting performance.
• Heavy-Duty Construction: Reinforced tie straps, drive links, and rivets maximize reliability.
• KIS-40 Depth Gauge Included: Adjustable from 1/2 inch to 6 inches for controlled cutting depth.
• Enhanced Ventilation Safety: Helps produce smoother cuts and reduce the risk of rolling rafters.
• Quick Installation and Removal: Depth gauge can be installed, adjusted, or removed in seconds.
• Helps Prevent Kickback: Designed to improve control during roof ventilation operations.
• Made in the USA: Raptor carbide chain manufactured in the United States.

What Is It?

The Tempest TV434-002 VentMaster Conversion Kit is a specialized ventilation saw upgrade package designed for Stihl MS440 and larger chainsaws. It combines a high-performance guide bar, carbide rescue chain, sprocket, and adjustable depth gauge to create a complete cutting system for firefighting, ventilation, and rescue operations.

How Is It Used?

The kit is installed on a compatible chainsaw and used for vertical ventilation, roof operations, forcible entry, and rescue cutting applications. The carbide chain and depth gauge allow firefighters to safely cut through roofing materials, wood, glass, sheet metal, and other common structural materials encountered during emergency response operations.

Who Uses It?

• Municipal Fire Departments
• Volunteer Fire Departments
• Industrial Fire Brigades
• Aircraft Rescue and Firefighting (ARFF) Teams
• Technical Rescue Teams
• Urban Search and Rescue (USAR) Teams
• Fire Training Academies
• Emergency Response Agencies

Maintenance Information

• Inspect guide bar, chain, rim sprocket, and depth gauge before each use.
• Maintain proper chain tension during operation.
• Replace worn or damaged chain components immediately.
• Keep guide bar groove clean and free of debris.
• Inspect depth gauge settings before ventilation operations.
• Follow chainsaw manufacturer maintenance procedures.
• Store components in a clean, dry environment.

What Is It Used With?

• Stihl MS440 Chainsaws
• Compatible Stihl Chainsaws Larger Than MS440
• Fire and Rescue Ventilation Saws
• Roof Ventilation Operations
• Forcible Entry Equipment
• Firefighter PPE
• Rescue Equipment

Material

• COBALT Alloy Reinforced Guide Bar
• Carbide-Tipped Raptor Chain
• Hardened Steel Rim Sprocket
• Steel KIS-40 Depth Gauge
• Hardened Guide Bar Rails
• Sealed Nose Bearing Assembly

How to Install the Kit

Step 1: Remove Existing Components

• Remove the chainsaw side cover.
• Remove the existing guide bar and chain.
• Remove the existing drive sprocket if required.

Step 2: Install the Rim Sprocket

• Install the included heavy-duty rim sprocket onto the saw's drive assembly.
• Verify proper engagement with the clutch drum and drive mechanism.

Step 3: Install the VentMaster Guide Bar

• Mount the 20" VentMaster COBALT guide bar onto the saw.
• Ensure the bar is fully seated on the mounting studs and aligned with the adjuster pin.

Step 4: Install the Raptor Carbide Chain

• Route the Raptor carbide chain around the drive sprocket and guide bar.
• Verify cutter orientation before tensioning.
• Install the side cover and apply proper chain tension.

Step 5: Install the KIS-40 Depth Gauge

• Attach the KIS-40 depth gauge to the slotted VentMaster guide bar.
• Set the desired cutting depth between 1/2" and 6" depending on roofing material and operational requirements.
• Tighten mounting hardware securely.

Step 6: Inspect and Test

• Verify chain tension.
• Confirm chain lubrication is functioning properly.
• Ensure the depth gauge is secure and adjusted correctly.
• Perform a test run before placing the saw into service.

Why Fire Departments Use This Kit

Unlike a standard chainsaw setup, the VentMaster system is designed specifically for fire and rescue operations:

• Allows safer and more controlled roof ventilation cuts.
• Depth gauge helps prevent cutting structural members.
• Carbide chain withstands abrasive roofing materials.
• Cuts through multiple construction materials without frequent chain replacement.
• Helps reduce kickback and improves control during vertical ventilation operations.
• Produces smoother cuts and reduces the risk of "rolling rafters."

Materials the Raptor Carbide Chain Can Cut

• Plexiglass
• Lexan
• Hurricane Glass
• Tar Roofing
• Asphalt Roofing
• Nails
• Light-Gauge Sheet Metal
• Wire-Reinforced Belting
• Trees
• Green Wood
• Various composite roofing materials

Benefits of the KIS-40 Depth Gauge

Adjustable cutting depth from 1/2" to 6"

• Installs or removes in seconds
• Helps prevent over-cutting
• Reduces the chance of striking rafters
• Improves operator control
• Helps minimize kickback
• Does not trap debris or heat like some traditional depth gauges

This makes the TV434-002 an excellent upgrade for departments performing vertical ventilation, forcible entry, and rescue operations using Stihl MS440-class chainsaws.

The Tempest TV434-002 VentMaster Conversion Kit is designed for:

• Stihl MS440 chainsaws
• Stihl 044 chainsaws
• Other Stihl saws larger than the MS440 platform that utilize compatible bar mount and drive configurations.

What's Included

The Tempest TV434-002 kit includes:

• 20" VentMaster COBALT Guide Bar
• 20" Raptor Carbide Chain Loop
• Heavy-Duty Rim Sprocket
• KIS-40 Adjustable Depth Gauge