How-to guide · how to insert a range hood block in autocad

How to insert a range hood block in AutoCAD

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By Saumyajit Maity · Published 25 Jun 2022 · Updated 24 Dec 2025

A range hood is unusual among kitchen blocks because its placement is entirely governed by another appliance: it must sit directly above the hob, centred on it, at a defined mounting height. That makes the hood a coordination exercise more than a freestanding placement — get it lined up with the cooktop in both plan and elevation and the ventilation reads correctly. This guide covers inserting a range hood block in AutoCAD and locking it to the hob below.

The worked example is a wall-mounted chimney hood, the most common type, but the same alignment logic applies to integrated hoods hidden in a cabinet, island hoods that hang from the ceiling, and visor hoods built into a wall unit. Because the hood's whole job is communicated in elevation, we give the elevation view as much attention as the plan.

Step 1 — Match the hood to the hob width

Download a range hood block in DWG, choosing the type that suits the installation: a wall-mounted chimney hood for a hob against a wall, an island hood for a hob in an island, or an integrated hood for a concealed extractor in a wall unit. The hood should be at least as wide as the hob it serves, and ideally a little wider, so a 600 mm hob pairs with a 600 mm or 900 mm hood and a 900 mm hob with a 900 mm hood.

You will likely want both views: the plan to show the hood's footprint over the hob, and the elevation to show it on the wall at the right height. Save the DWG to your library; the blocks are full size in millimetres.

Step 2 — Set units and insert the plan view

Confirm your insertion units first — type UNITS and check 'Insertion scale' is Millimeters so the hood arrives at true size. With INSUNITS correct, AutoCAD reconciles the block's units automatically.

Run INSERT, browse to the hood DWG (the plan view), and place it roughly above the hob with 'Specify On-screen' ticked for the insertion point. Leave the scale at 1. The hood drops in as a single block reference. Because a hood hangs above the worktop, its plan outline overlaps the hob and the wall cabinets — that overlap is expected and is why you keep the hood on its own layer so it reads as an overhead element.

Step 3 — Centre the hood over the hob

The hood must be centred on the hob, not on the cabinet, not on the wall. Use MOVE with a midpoint-to-midpoint snap: pick the midpoint of the hood and snap it to the midpoint of the hob below. If you placed a construction line down the hob centreline when you positioned the cooktop, snap the hood to that line and the two appliances align perfectly.

Push the hood back to the wall so its rear sits against the wall line, the same plane the wall cabinets work to. For an island hood there is no wall, so centre it on the island hob in both directions and let it hang from the ceiling. The plan now shows the extraction zone sitting squarely over the cooking surface.

Step 4 — Set the mounting height in elevation

The elevation is where the hood's mounting height is fixed, and it is the dimension installers care about. A wall-mounted hood typically hangs 650–750 mm above a gas hob and can sit a little lower over induction, where there is no flame. Insert the elevation hood block, then MOVE it vertically so its underside sits at that height above the hob surface.

The hood's chimney or ducting runs up from the canopy to the ceiling or to the soffit, so draw or include that riser in the elevation. Line the chimney up with the centre of the hob below. Keeping the canopy underside dimension on the drawing — measured from the finished hob surface — tells the installer exactly where to fix the bracket, which is the whole point of the elevation.

Step 5 — Layer it and note the ducting

Put the hood on a mechanical or appliance layer so it can be toggled with the rest of the ventilation. A hood is part of the kitchen's extract system, so on a services-coordinated drawing it often belongs with the mechanical information rather than the cabinetry. Tag it with an attribute for its extraction rate if you are scheduling appliances.

Note whether the hood is ducted to outside or recirculating: a ducted hood needs a route for the duct, often through the ceiling void or an external wall, and that route is worth showing or annotating so it is coordinated with the structure. A recirculating hood vents back into the room through a charcoal filter and needs no external duct, which is a useful note for the contractor. When the cooking station is finalised, you can WBLOCK the hob-and-hood pair so they always move together.

Common hood placement mistakes

The first mistake is the units mismatch — if the hood is the wrong size, fix INSUNITS. The second, and the one specific to hoods, is centring the hood on the cabinet or the wall rather than on the hob; a hood that is offset from the burners doesn't extract properly and looks wrong in elevation. Always snap to the hob centreline.

Third is the mounting height: too high and the hood won't capture the steam and smoke; too low and it is a head-clearance hazard over the hob. Stick to the 650–750 mm range for gas. Fourth is forgetting the ducting route — a beautifully placed hood with no plausible path for its duct is a coordination gap that surfaces on site, so resolve and annotate the duct run while the hood is still on the drawing board.

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Questions

Frequently asked

How high above the hob should a range hood go?+

A wall-mounted hood typically hangs 650–750 mm above a gas hob, and can sit slightly lower over induction where there is no flame. Set that dimension from the finished hob surface to the canopy underside in your elevation so the installer can fix the bracket correctly.

Should the hood be as wide as the hob?+

At least as wide, ideally a little wider, so it captures steam and smoke rising from the outer burners. Pair a 600 mm hob with a 600 mm or 900 mm hood, and a 900 mm hob with a 900 mm hood.

How do I align the hood with the hob exactly?+

Snap the hood's midpoint to the hob's midpoint with the MOVE command. If you dropped a construction line down the hob centreline when placing the cooktop, snap the hood to that same line so both appliances and the elevation all agree.

What's the difference between a ducted and recirculating hood?+

A ducted hood vents air outside through a duct, so it needs a route through the ceiling void or an external wall. A recirculating hood filters the air through charcoal and returns it to the room, needing no external duct. Note which type the drawing assumes.

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