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Hayward 400K Negative Pressure Indoor Vent Adapter | UHXNEGVT14008

Hayward Products SKU: UHXNEGVT14008
Hayward 400K Negative Pressure Indoor Vent Adapter | UHXNEGVT14008 - Heater Parts - img - 1
Hayward Universal H-Series Low NOx Heater Not sure it fits? See this part on the interactive diagram Hayward Universal H-Series Low NOx Heater

Hayward 400K Negative Pressure Indoor Vent Adapter | UHXNEGVT14008

Hayward Products SKU: UHXNEGVT14008
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Hayward UHXNEGVT14008 Negative Pressure Vertical Indoor Vent Adapter Kit, 8" (H400FD)

Hayward UHXNEGVT14008 is a genuine negative-pressure vertical indoor vent adapter kit designed for Hayward Universal H-Series H400FD (FDN/FDP) Low NOx heaters. It provides the proper 8" vent connection required for approved indoor (and certain covered outdoor) vertical venting installations when the site requires negative-pressure venting configuration.

Key Features

  • Part Number: UHXNEGVT14008
  • Brand: Hayward
  • Type: Negative pressure vertical indoor vent adapter kit
  • Vent Size: 8" diameter adapter
  • Heater Compatibility: Hayward Universal H-Series H400FD models (commonly listed for H400FDN and H400FDP)
  • Use Case: Indoor vertical venting (and certain covered outdoor venting situations when allowed by installation instructions)
  • Genuine Hayward replacement kit for correct fit and code-compliant installation (when installed per Hayward instructions)
  • Common note: listed as replacing older kit UHXNEGVT14001 in many references

Applications

Used for approved venting configurations on compatible Hayward H400FD heaters where an 8" negative-pressure vertical vent adapter is required. Often used in commercial or in-ground installations that need a specific indoor venting setup.

Installation Notes

  • Verify the exact heater model (H400FDN/H400FDP) and the required venting type before ordering.
  • Venting must follow Hayward installation instructions and local code requirements.
  • Professional installation is strongly recommended for gas heater venting components.
  • Inspect the venting path, clearances, and termination requirements during installation.

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Maintenance Tips

  • Inspect vent connections and supports periodically for looseness, corrosion, or signs of leakage.
  • Keep the heater area clear and maintain required clearances for safe combustion air and service access.
  • If the heater shows vent/pressure fault codes, verify venting configuration and restrictions before replacing parts.
  • Have venting inspected during annual heater service, especially on indoor installations.
Questions about returns? View our return policy.

Hours Of Operation:

Monday - Friday: 7:00 am to 5:00 pm Phoenix Time

Saturday: 8:00 am to 2:00 pm

Sunday: Closed

  • We do not ship on Saturday or Sunday.
  • Orders totaling more than $300 will require signature confirmation upon delivery.
  • We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
  • Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
  • Expedited shipping options are available at checkout.

Return Policy:

  • Products that are received damaged will receive a refund in store credit.
  • Most products are eligible for return within 30 days of receipt, except where noted below.
  • To initiate a return, please complete an RMA form prior to sending your item back.
  • Original shipping costs are non-refundable and will be deducted from the return credit.
  • Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
  • Some returns will be charged an automatic 15% restocking fee.
  • We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
  • Please complete the return form to receive your RMA number and return shipping label.
  • Chemical products are not eligible for return under any circumstances.
  • The Pentair Colorsync 618031 is not eligible for return.
  • Pool cleaners are not eligible for return.
  • Opened seals and o-rings are not eligible for return.
  • Capacitors are not eligible for return.
  • Plastic popup tools are not eligible for return.
  • Automation components and circuit boards are not eligible for return.
  • If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
  • Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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