# Installation, Fulfillment, and Safety Guide

Applies to release 2026-08-19. Include this guide with every digital download and
link it from every physical listing.

## Before installation

1. Shut down the miner through its normal interface, disconnect mains power, and
   allow the miner and PSU to cool.
2. Confirm the exact miner name is included in the product's compatibility field.
   Do not infer fit from a broad family name.
3. Inspect the printed part for cracks, incomplete walls, lifted corners, loose
   strings, or a distorted collar. Reject a damaged part.
4. Keep the OEM fans and firmware protection active. These products are duct
   interfaces, not fan-delete devices.
5. These printed parts are combustible airflow accessories. They are not electrical
   enclosures, fire barriers, guards, or certified safety devices. Keep them clear of
   exposed conductors, heaters, sparks, and open flame.
6. Route exhaust outdoors or to a designed heat-recovery system. Never recirculate hot
   exhaust into the room, miner inlet, or PSU inlet.

## Housing-wrap products: S9, S17, and S19

- Install only on the miner's main exhaust housing. No released wrap captures PSU air.
- Slide the 25 mm skirt squarely over the supported housing face. Do not hammer or
  heat the part to force it on.
- Use four M4 x 12 mm self-tapping set screws in the modeled 3.6 mm pilots. Turn each
  screw by hand until its tip just contacts the flat steel housing, then alternate
  sides to remove play. Do not torque the housing inward.
- Check that no screw can contact a fan blade, cable, connector, or circuit board.

## Fan-flange products

- Reuse the OEM fan fasteners only when their remaining thread engagement is adequate.
  Otherwise use equivalent M4 hardware of the correct length and strength.
- Before power is restored, visually confirm that no fastener protrudes through the
  shroud/fan stack far enough to contact a fan blade, cable, connector, hashboard, or
  other internal component. Long stock fan screws can become unsafe after the stack
  thickness changes; never choose screw length by name alone.
- Start all fasteners by hand, then tighten in a cross pattern. Do not crush the
  printed gasket land or distort the fan frame.
- Where a gasket groove is present, use a thin closed-cell foam or compatible gasket
  seated fully inside the groove. Do not allow gasket material into the air opening.

## Flexible duct connection

- The 6-inch and 8-inch male collars are designed for nominal flexible duct placed
  over the collar. Seat the duct on the straight land below the retention bead and
  secure it with a correctly sized worm-drive clamp.
- Support duct weight independently. The printed collar is not a hanger.
- Do not force rigid pipe or a Cloudline molded socket directly over the collar.
  Use a standard flexible-duct/clamp transition.

## Commissioning

1. Keep the duct run open, supported, and as short/straight as practical.
2. Restart the miner and immediately confirm all OEM fans report normally.
3. Monitor fan speed, chip temperature, and fault logs for at least 30 minutes at
   normal load. Shut down if temperatures rise abnormally, a fan faults, the duct
   collapses, or the part softens or moves.
4. Recheck fasteners and the duct clamp after the first heat cycle and periodically
   thereafter.

Dual-140-to-6-inch products have an inherent area contraction. Prefer the 8-inch
variant unless the system has been engineered for the restriction. Never use one
inline fan as the sole airflow source for multiple miners without a system-level
airflow design.

## Production material

D-Central prints this line in PETG. We offer it in black and orange.

A printed part is not a certified safety device. Do not advertise a UL 94 or fire rating
for one unless the exact material, colour, and process have supporting certification.
