Napoleon identifies model GD401 as Periscope (Snorkel) for Wall Penetration Below Grade, 5/8". This item is listed in the manufacturer’s direct vent flex venting product section.
| Manufacturer | Napoleon |
|---|---|
| Model / part number | GD401 |
| Product specification | Periscope (Snorkel) for Wall Penetration Below Grade, 5/8" |
| Manufacturer product section | direct vent flex venting |
Match this exact part number to the applicable appliance installation manual and venting or heat-management instructions. Its listing in a product section does not make it required for every appliance in that section. Required components and quantities depend on the documented appliance and installation configuration.
Installation must follow the applicable Napoleon instructions and local codes. Use only the approved component combination for the exact appliance.
Napoleon official direct vent flex venting reference, United States price book effective May 12, 2026.
Request a return within 30 calendar days after delivery for eligible new, unused, unassembled and uninstalled items in original packaging. Written authorization is required. Read the Returns Policy for conditions, fees and exclusions.
Most in-stock items are released for shipment within 1–2 business days after payment and order review. Carrier transit is additional. Parcel transit commonly takes 3–7 business days; freight commonly takes 5–10 business days after shipment. Special-order and backordered items may take longer. Shipping details, exclusions and damage reporting.
Napoleon identifies model GD401 as Periscope (Snorkel) for Wall Penetration Below Grade, 5/8". This item is listed in the manufacturer’s direct vent flex venting product section.
| Manufacturer | Napoleon |
|---|---|
| Model / part number | GD401 |
| Product specification | Periscope (Snorkel) for Wall Penetration Below Grade, 5/8" |
| Manufacturer product section | direct vent flex venting |
Match this exact part number to the applicable appliance installation manual and venting or heat-management instructions. Its listing in a product section does not make it required for every appliance in that section. Required components and quantities depend on the documented appliance and installation configuration.
Installation must follow the applicable Napoleon instructions and local codes. Use only the approved component combination for the exact appliance.
Napoleon official direct vent flex venting reference, United States price book effective May 12, 2026.
