Drawing review for mechanical and HVAC engineers

Put your layout over the architectural plan to see clashes, then mark them up and take off what the job needs.

EXAM103EXAM104110'-0"12'-0"ADESIGN DEVELOPMENT2026-08-29BPERMIT SET2026-09-18CADDENDUM 12026-10-09REV C104104AHU-2

Illustration drawn in the style of the product, not a screenshot.

Workflows that apply

Overlay clash checks

Overlay sheets in different colours, align them by two points, and mark up the clashes on the sheet you are reviewing.

Compare and overlay →

Takeoff

Lengths of duct and pipe runs, areas, and counts of diffusers or units at the sheet’s scale, totalled by subject or room.

Takeoff and estimating →

Symbol search

Draw a box around one diffuser and find the others on the sheet or the set; matches become counts.

Takeoff and estimating →

An example from our sample set

In the sample Lakeside set, overlaying the level 2 mechanical plan (M-102) on the lighting plan (E-102) shows the conference room’s supply diffuser sitting on a light fitting — the kind of clash the overlay is for.

Our sample sets are generated, fictional drawings made for demonstrations.

Good to know

  • Clashes are found visually by overlaying sheets; there is no automatic 3D clash detection.

Bring your next drawing set.

We are onboarding teams in early access. Tell us about your projects and we will set you up — or compare two drawings in your browser right now, no account needed.