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A gas quick-disconnect hose and a restraining cable behind a commercial fryer.

Clearances, utilities, drains and airflow

Installation and setup
guides.

Air around a condensing unit, the gas, the voltage and the phase a unit was built for, water treatment and drains for dish machines and combis, and the hood and clearances a cooking line needs.

(844) 571-4566

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Installation and setup,
guide by guide.

Plenty of the repair calls a business makes were set up on the day the equipment arrived. A gas fryer rolled into place without its restraint, a condensing unit squeezed into a roof corner behind a screen wall, a row of tumblers joined into a duct too long for the blower: each works on the first day and wears out early after that.

All 18 guides
The back of a commercial kitchen cooking line pulled a little away from the tiled wall for cleaning, a stainless gas fryer on casters with its coated stainless flexible gas hose looping down to a quick-disconnect coupling on the gas pipe and a separate steel restraint cable running from the fryer's back panel to a wall anchor, the fryer and the gas pipe's shutoff valve in clear view, nothing outdoors.
5-minute read

Gas quick-disconnects, hoses and restraint cables on caster-mounted cooking equipment

The ANSI standards the makers name, why the restraint takes the pull instead of the hose, cleaning night and the fire system above, and the signs a connector needs the installer.

A flat restaurant roof on a clear day with a commercial condensing unit for a walk-in cooler standing on steel rails, open gravel around the condensing unit on every side, its insulated copper lines running into a roof curb, the kitchen's mushroom-shaped exhaust fan a good distance away across the roof.
5-minute read

Space and airflow around rooftop condensing units: widths, pits, screen walls and exhaust fans

Heatcraft's one-width rule, pits and decorative fences, units side by side, grease from the hood fan landing on the coil, roof structure and noise, and what a manager can watch from below.

The back service corridor of a busy commercial laundry behind a row of stacked tumblers, round smooth metal exhaust ducts rising from each tumbler and joining a larger main duct at angled branches before it exits through the block wall, a clean inspection door on the main duct, a large louvered makeup air opening low on the far wall, the floor swept free of lint, a laundry attendant seen only from behind wheeling a cart past the far end, nothing outdoors.
5-minute read

Laundry venting and makeup air for tumblers: duct runs, shared mains and the lint schedule

Why every tumbler needs air in as well as out, Dexter's duct lengths, elbows and outlet rules, joining a row into one main, dry-cleaning vapors, and the daily-to-yearly lint routine.

Clearances, utilities, drains and airflow.

The guides in this section follow the makers' installation manuals, since those are the documents the installer and the inspector work from. They cover gas connections and quick-disconnects on caster-mounted cooking equipment, space and airflow around rooftop condensing units, and exhaust and makeup air for commercial laundry.

They are written for the owner or manager who signs off on the work rather than the person holding the wrench. Each one says what the manual requires, what a finished installation should look like on a walk-through, and which trade takes over: the installer for gas and ducts, an electrician for power, a structural engineer for a loaded roof, a fire-protection contractor under the hood, and a technician holding the EPA's Section 608 credential for any work that opens refrigerant piping.

Read the relevant guide before new equipment is ordered, before the line is rearranged and before a contractor sets anything on the roof or cuts a wall. Changing a location on paper costs nothing; moving it after start-up usually means the same trades a second time.

Not sure where to start?

The short answerGas quick-disconnects, hoses and restraint cables on caster-mounted cooking equipment

A gas quick-disconnect lets a fryer, griddle or oven on casters roll out for cleaning.

The short answerSpace and airflow around rooftop condensing units: widths, pits, screen walls and exhaust fans

Rooftop condensing unit clearance comes from the maker's manual.

The short answerLaundry venting and makeup air for tumblers: duct runs, shared mains and the lint schedule

Commercial dryer venting follows the maker's installation manual: smooth metal duct of the stated diameter run outdoors, as short as the manual allows, joints lapped in the direction of flow, no screen on the outlet, and makeup air openings sized for every tumbler in the room.

When reading
is not enough.

If the checks in these guides did not settle it, the visit picks up from there, stop by stop.

What repairs cost
  1. 01Safety and supply before anything else
  2. 02The cause, and what it costs
  3. 03Parts that ride along
  4. 04Proved under load before we leave

The problems
these answer.

Each has a page of its own, with the causes in the order worth checking.

All 17 problems
An empty stainless restaurant cooking line after hours, every burner on the fryers and griddle dark and cold, a yellow gas shutoff handle on the pipe behind the line turned crosswise to closed, the back door of the commercial kitchen propped open to the night. Gas, fire, food at risk or water near power

Commercial Kitchen Gas Smell Along the Cooking Line: Clear the Room First

6 causes, cheapest first

 Close view through the open lower door of a stainless commercial griddle, a small blue pilot flame barely visible at the tip of the pilot burner beside a copper thermocouple tube, grease-darkened steel around it. Problem

Pilot Won't Stay Lit on a Fryer, Griddle or Steamer on the Line

6 causes, cheapest first

 A stainless commercial fryer on a kitchen line with its oil sitting still and pale in the vat, two empty wire baskets hanging on the rack above, the burner sight opening at the front dark. Problem

Commercial Fryer Not Heating or Slow to Recover Between Baskets

6 causes, cheapest first

 The heavy stainless door of a walk-in cooler standing wide open onto a commercial kitchen, a torn clear strip curtain hanging to one side, shelves inside with covered food pans and crates, a digital thermometer on the wall showing only a warm amber glow. Gas, fire, food at risk or water near power

Walk-In Cooler Warm Above 41°F With Food Inside

6 causes, cheapest first
A restaurant team working a busy commercial kitchen line.
For the heart of your home.

Questions about
installation and setup.

Who is responsible for following the maker's installation manual?
The installer does the work to the manual and local code, but the owner keeps the equipment afterward. Ask for the manual, the start-up checks and the gas type or supply details on paper when the job is signed off.
Can the crew move caster-mounted cooking equipment for cleaning?
That is what the casters are for, within the steps the maker gives: gas off before a restraint comes off, the restraint back on, the unit returned to its marks. Anything involving the gas coupling itself is shown by the installer from the manual.
Does it matter where a rooftop condensing unit goes if it fits?
Yes. Makers such as Heatcraft set open space around the unit, nothing overhead and distance from exhaust fans, because a unit that breathes its own hot air loses capacity and wears its compressor.
Why does a commercial laundry need openings to the outside?
Every tumbler exhausts a large volume of room air, and the makeup air openings replace it. Dexter gives a size for each machine, counted as open area once the grille or louver is taken into account.

The other
sections.

Split by what you are trying to find out rather than by which part of the appliance it concerns.

All guides
A thermometer on a walk-in cooler shelf reading warm, seen close.
What the box, the vat and the drum are telling you

Common problems

A finger on the controller keypad of a reach-in cabinet, the display dark.
Safe checks with the unit off

Troubleshooting

A soft brush and a shop vacuum at the condenser grille of a reach-in cabinet, the unit off.
A maintenance plan that keeps the line running

Maintenance and prevention

A Class K extinguisher mounted beside a fryer line under a hood.
Gas, fryer fires, safe holding and the health inspector

Gas, fire and food safety

A combi oven and a convection oven side by side on a restaurant line.
Gas or electric, repair or replace, lease or buy

Choosing and comparing

Not sure which section?

Start from your question

The four questions most visits start with, each with the guide that answers it.

18 guidesWhere to start Where to start

Back to your everyday

Let’s get your commercial appliance working again.

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