How to Choose a Commercial Door Closer: Surface vs Concealed, Mounting, and Size

A door closer spec has two halves: where the closer body goes, and how much spring power it carries. The first is set by the door, the frame, and how much hardware the architect will accept seeing; the second by door width, exposure, and the ADA opening force limit. Here is how the four families compare.

Surface mounted

The body sits on the door or frame, nothing is cut into either, and every valve stays reachable for the life of the opening. Surface closers also carry the widest size range: adjustable spring sizes 1 to 6 on the LCN 4050A and 4040XP, both certified to ANSI/BHMA A156.4 Grade 1 and UL and cUL listed. LCN publishes the 4040XP non-sized cylinder as adjustable for interior doors to 5'0" and exterior doors to 4'0".

Surface closers mount three ways, all published for the LCN 4040XP: "hinge pull side, push side top jamb and push side parallel arm".

• Regular arm (hinge, pull side). Arm out to the frame face. Easiest position for low opening force, but the arm sits out in the opening.
• Top jamb (push side). Body on the frame face, arm down to the leaf. The answer when the door has no top rail to hold a closer.
• Parallel arm (push side). Arm folded back along the frame head. The most protected position and the corridor default; it takes a stop in the shoe: LCN's Cush-N-Stop arm caps the opening at 110 degrees where other arms allow 180.

Top rail decides whether you also buy a plate: LCN's 4050A needs one on a hinge side mount where the top rail is under 3-7/8 in. (98 mm), and another for parallel arm where it is under 5-3/4 in. (146 mm) from the stop.

Concealed in the door

The closer is morticed into the leaf, so a closed door shows almost nothing. LCN builds the 3030 and 3130 for concealment within 1-3/4 in. interior doors, certified to A156.4 Grade 1, with adjustable spring sizes 1 to 3 and 1 to 4 and sized cylinders for interior doors to 4'0". Dormakaba's ITS96 suits interior wood, hollow metal, and aluminum doors, meets UL 10C for positive pressure, and in Dormakaba's words meets "the requirements of ANSI/BHMA A117.1 and ADA for barrier-free accessibility". Two catches: the leaf has to be prepped, so the decision lands at door order time, and the swing is tighter, with the ITS96 maximum opening at approximately 130 degrees.

Concealed in the frame or transom

The body lives in the head or transom bar and drives the leaf through a track or lever arm. LCN's 2030, 5030, and 6030 are built for "concealment in narrow aluminum transoms", the 2030 and 6030 with a concealed track in the door and the 5030 with an exposed double-lever arm, adjustable 1 to 5 on the 2030 and 6030. This is the storefront answer when the leaf cannot be cut.

Floor closers

The closer goes under the finished floor. Dormakaba's BTS80 is ANSI/BHMA Grade 1 certified, non-handed, and rated to control "exceptionally heavy single- and double-acting doors". Spring sizes are fixed rather than adjustable, so sizing happens at order time. Budget for the pocket, and for service that means opening the floor.

Side by side

How size is chosen, and what ADA requires

Size is spring power, 1 at the light end to 6 at the heavy end, and it tracks door width and exposure: the same cylinder published for an interior door to 5'0" is good for an exterior door only to 4'0", because wind and stack pressure eat a margin an interior door never gives up.

Accessibility caps the power you leave in. ADA 404.2.9 gives "Interior hinged doors and gates: 5 pounds (22.2 N) maximum" for any "door or gate other than fire doors", while a fire door instead gets "a minimum opening force allowable by the appropriate administrative authority". Two exclusions matter: the Standards set no figure for exterior doors, and "These forces do not apply to the force required to retract latch bolts or disengage other devices that hold the door or gate in a closed position."

ADA 404.2.8.1 covers speed: "Door closers and gate closers shall be adjusted so that from an open position of 90 degrees, the time required to move the door to a position of 12 degrees from the latch is 5 seconds minimum."

Low force and positive latching fight each other, which is why cam action closers exist. Norton, one of the lines we quote, says cam action closers "are a smart choice when doors need to reliably close while maintaining a low opening force for accessibility". Dormakaba says all of its closers adjustable to Size 1 comply with barrier-free requirements, and LCN will build the 4050A with less than 5.0 lbs. opening force on a 36" door.

What A156.4 grades tell you

Norton describes it plainly: closers "are assigned one of three grades as determined by ANSI/BHMA 156.4", and the grades "serve as a benchmark for endurance". LCN certifies the 4040XP, 4050A, 3030, and 3130 to A156.4 Grade 1; Dormakaba lists the TS93, BTS80, 8900, 8600, and 7400 as Grade 1 certified. For school corridors, healthcare, and exterior entries, spec Grade 1.

What to spec

• School and healthcare corridors: surface, parallel arm, Grade 1, delayed action where carts and beds come through.
• Exterior entries: surface, sized for the exterior width, in a coating rated for the exposure.
• Interiors where hardware cannot show: concealed in the door, decided at door order time, or in the frame where the leaf cannot be cut.
• Glass or heavy double-acting entries: floor closer, pocket detailed before the slab goes in.
• Labeled openings: a UL 10C listed closer, and ADA's 5 pound limit does not reach the fire door itself. The AHJ sets that force.

Closers are a quote-to-order line for us, not a click-to-cart one. Send the door schedule, or just width, material, handing, exposure, and whether the opening is labeled, and we will quote door closers from Dormakaba, LCN, and Norton, with panic exit devices where egress hardware is in scope.