Allegro 12" Manhole Ventilation Passthru (MVP)

The Allegro 12" Manhole Ventilation Passthru (MVP) is designed to maintain and redirect airflow into manholes, sewers, tanks, utility vaults, and other confined spaces while minimizing obstruction at the entry point. The integrated system combines a low-profile air vent, 90-degree elbow, and built-in mounting into a single portable assembly.

The low-profile elbow is designed to fit beneath the lower crossbar of a compatible manhole guardrail, helping preserve worker access while ventilation is operating. Flat channeled corners allow the manhole cover to help stabilize the assembly during use.

An integrated 12-inch collapsible duct extends approximately 6 feet into the confined space. The duct compresses to allow personnel to pass during entry and then springs back into shape to maintain airflow. When not in use, the duct stores in an integrated bag and can be rapidly deployed using the quick-release drawstring.

The MVP body is constructed from recyclable linear low-density polyethylene (LLDPE) in high-visibility yellow. The ducting is constructed from vinyl and polyester with a PVC coating and is heat resistant to 180°F. This model is not statically conductive.

Duct Diameter: 12 in.

Duct Length: 6 ft.

Duct Type: Collapsible

Duct Material: Vinyl/polyester with PVC coating

Maximum Duct Temperature: 180°F (82.2°C)

Housing Material: Linear Low-Density Polyethylene (LLDPE)

Color: High-Visibility Yellow

Length with Duct Stored: 37 in.

Length with Duct Deployed: 67 in.

Width: 23 in.

Height: 28 in.

Weight: 17 lb.

Static Conductivity: Not statically conductive

Manufacturer Part Number: 9510-60

Standards/Compliance: ASTM 227; UL 94V-0 flame-retardant ducting