6″ 45° Duct Elbow

Description

6 inch 45 degree duct elbow for miner exhaust

A 6 inch 45 degree duct elbow is the fitting you reach for first whenever the run has to change direction. Bends are where a duct system spends its pressure budget, and the cost of a bend climbs steeply as the turn tightens. Splitting a right angle into two gentle turns instead of one sharp one is the least expensive improvement available anywhere in an exhaust run: one extra fitting, a few centimetres of space, and the fan gets back pressure you already paid for at the wall socket.

The bore holds full 6-inch cross-section through the turn, so the elbow changes the direction of the air without also changing its speed. Both ends carry the standard 6-inch collar used across the whole D-Central line.

Drawn in-house, printed as one continuous body. There is no seam on the inside of the bend for the flow to trip over.

What it fits

Standard 6-inch duct on both ends, rigid or flexible, and any 6-inch fitting in the line directly. If the corner you have to turn is a full right angle and you have the room, use two of these with a short straight between them — a 6″ Duct Coupler and an offcut is the usual way to make that straight. If you do not have the room, the answer is the 6″ 90° Duct Elbow (Compact). The same 45 exists for larger trunks as the 8″ 45° Duct Elbow.

How it is used

1. Offer the elbow up to the run and rotate it to the angle the route actually needs; 45° fittings can be clocked to any orientation around the duct axis, not just up and down.
2. Slide duct or fitting onto each collar.
3. Band-clamp both ends.
4. Strap or hang the duct either side of the bend so the elbow is not carrying the run.

Chain two or three of them to step a run around a beam, a doorway or a rack upright instead of forcing it into a series of hard corners.

Why 45s instead of 90s

When air turns, the stream on the inside of the bend has to accelerate and then slow again, and past a certain tightness it separates from the wall and leaves a recirculating pocket that the rest of the flow has to squeeze past. The gentler the turn, the less of that happens. Published duct-loss relationships put a sharp turn well above a gentle one, and two 45s separated by a short straight let the flow reattach between them. It is a real difference on a run with several bends in it.

• Turns the run 45° while holding full 6-inch cross-section through the bend
• Pairs with a second 45 to make a right angle that flows better than a sharp 90
• Clocks to any orientation around the duct axis, so it routes in three dimensions
• Chains for gradual routing around beams, uprights and door heads
• Comes out as one body with no internal seam on the inside of the bend

Specifications

Open source — the elbow geometry is published, free

D-Central Technologies drew this elbow — the sweep, the collars, the wall sections — and released it open source under CC BY-SA 4.0 through the 3D models download center. Our geometry, published because nothing about a duct bend deserves to be proprietary. Go straight to the 6″ 45° elbow model card, then change the angle, scale the bore, use it in your own product, sell what you print.

The file is elbow_45_6.zip: STL, CC BY-SA 4.0 licence, installation and safety guide. The listing you are on is the finished elbow instead, made to order in PETG, black or orange, and shipped from Montreal, Quebec, with the collars sized to mate the rest of the line on the first try. That is the trade — the drawing is free and stays free, and buying the part or backing D-Central’s fund page pays for the next design.

Works with

• 8″ 45° Duct Elbow
• 6″ 90° Duct Elbow (Compact)
• 6″ Duct Coupler
• 6″ Window Exhaust Port
• Antminer S19 / S21 Dual 120 mm to 6″ Duct Shroud

Shroud, elbow, coupler, port, all cut to one collar standard: see the D-Central shroud and ducting system.

Frequently asked questions