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Yellow vinyl polyester manhole ventilation pass-through with collapsible duct and storage bag

Allegro

Allegro 9510-50 Manhole Ventilation Pass Thru leaf blower

SKU CH-MEEY-86H75

An 8-inch pass-through duct for manhole ventilation, supplied with collapsible hose and storage bag

  • TypeElectric Blowers
  • Size/Dimensions8"
  • ColorYellow
  • 8 in outlet diameter fits standard ducting for efficient airflow
  • Yellow vinyl polyester construction resists wear in manhole environments
  • Collapsible duct and storage bag enable quick setup and compact transport
  • 20 in width provides broad coverage for effective ventilation
  • Meets ASTM 227 standard for confined-space safety compliance

Allegro 9510-50 Pass-Through Ventilation

The Allegro 9510-50 is a manhole ventilation pass-through accessory designed for confined-space airflow. It connects to compatible blowers and ducting to direct fresh air into underground work areas. The unit includes a collapsible duct and a storage bag for transport. It suits utility crews and maintenance teams who need reliable ventilation during manhole entry.

Thermals Noise and Power Draw

This accessory has no motor, fan or electrical components of its own. It adds no heat, noise or power draw to the system. Airflow performance depends entirely on the blower it is paired with. The vinyl-polyester construction does not conduct electricity, so it does not affect the thermal or acoustic profile of the connected equipment.

Build Fit and Clearance

The pass-through has an 8 in outlet diameter and a 20 in width to span the opening. Its 5 1/8 ft length provides reach from the blower to the manhole. The collapsible duct stores compactly in the included bag, freeing vehicle space when not in use. It meets ASTM 227 for confined-space ventilation applications. Workers needing conductive materials or different diameters will need a different accessory.

Highlights

  • 8 in outlet diameter fits standard ducting for efficient airflow
  • Yellow vinyl polyester construction resists wear in manhole environments
  • Collapsible duct and storage bag enable quick setup and compact transport
  • 20 in width provides broad coverage for effective ventilation
  • Meets ASTM 227 standard for confined-space safety compliance

Specifications

BrandALLEGRO
TypeElectric Blowers
Size/Dimensions8"
ColorYellow

Questions about this item

How do I install the Allegro 9510-50 pass-thru and what step is often missed?

Position the 20 in wide vinyl polyester sleeve over the manhole opening, attach the 8 in outlet to the blower duct, then secure the integrated collar — the step often missed is fully tightening that collar so the duct cannot pull free under airflow.

What maintenance or replacement will the Allegro 9510-50 need later?

Inspect the yellow vinyl polyester fabric and the collapsible duct after each use for tears or UV damage; replace the entire pass-thru assembly if the material no longer holds air pressure or if the storage bag zipper fails.

What limit appears first on the Allegro 9510-50 during sustained ventilation?

The 8 in outlet diameter and the 5 1/8 ft duct length restrict airflow volume, so the first limit under continuous use is the maximum air volume the fixed geometry can deliver without excessive back-pressure.

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