HomeMy WebLinkAbout21 Cutsheet Hollow Metal DoorsFrames • MU Series multi-use
Book Rev. 09/26/24 • Page Rev. 11/01/22 • Technical data manual • • 33
MU Series multi-use
About the product
Steelcraft’s MU Series multi-use flush frames are designed for light to extra heavy duty applications in both commercial and institutional buildings. They can be installed in both interior
and exterior locations, and in virtually all types of buildings and wall constructions. They have a jamb profile similar to the DW
frames, but are designed to be installed as part of the wall framing sequence. They can be specified and/or supplied as either KD (knock-down) for field assembly prior to installation,
or welded for installation as a complete unit.
Installation1. Installation shall conform to the published Steelcraft
installation instructions, ANSI A250.11-2012 Recommended Erection Instructions for Steel Frames and HMMA 840.
2. Fire Rated Assemblies must be in accordance with NFPA Pamphlet 80. The Authority Having Jurisdiction is the final
authority in issues related to the installation and use of installed Fire Rated Doors.
Features and benefitsSteelcraft MU Series multi-use flush frames offer the following
unique features which enhance long-term functionality and durability. Features can vary depending on the steel thickness of the frame:
1. Die-mitered corner connections of the MU Series multi-
use flush frame corners lock together once the frame is installed. The tab/lock design:
a. prevents the head from rising
b. keeps the head and jamb members in alignment
c. keeps the miter tight
d. includes wedge-lock corner clips. Screws are supplied to secure miter.
2. Patented universal hinge preparations allow for easy field conversion from standard weight .134" (3.3 mm) thick
hinges to heavy weight 0.180" (4.7 mm) hinges.
3. Adjustable base anchors allow for installation adjustment when the floor is not level.
4. Factory prepared for field installed silencers.
5. Factory applied baked-on rust-inhibiting primer in accordance with ANSI A250.10-2011.
Specification compliance
1. Overall frame construction for Steelcraft MU Series multi-use flush frames meet the requirements of ANSI
A250.8-2017.
2. Hardware preparations and reinforcements are in
accordance with ANSI A250.6. Locations are in accordance with ANSI/DHI A115 unless otherwise stated.
Fire ratings
MU Series multi-use flush frames meet the broadest fire rating requirements. They are listed for installations requiring
compliance to both neutral pressure testing (ASTM E152 and UL 10B) and positive pressure standards (UL 10C). Refer to the Fire Rated Section of this manual for particular listings.
Typical wall construction and anchoring types
Profile Steel thickness Wall construction Typical wall anchors
MU16 16 Gauge [0.053" (1.3 mm)]Wood or steel stud Lock-in stud anchor
MU16 16 Gauge [0.053" (1.3 mm)]Masonry Wire masonry
MU16 16 Gauge [0.053" (1.3 mm)]Existing Masonry Bolted through soffit
MU14 14 Gauge [0.067" (1.7 mm)]Wood or steel stud Lock-in stud anchor
MU14 14 Gauge [0.067" (1.7 mm)]Masonry Wire masonry
MU14 14 Gauge [0.067" (1.7 mm)]Existing masonry Bolted through soffit
Frames • MU Series multi-use
34 • • Technical data manual • Book Rev. 09/26/24 • Page Rev. 08/29/18
Standard construction
Standard Double Rabbet Frame
Single Rabbet Frame
for frame depths 4 ⁄" and narrower
Elevation
1 ⁄"(40 mm)
Varies JambDepth
⁄" (16 mm)
1 ⁄"(49 mm)
Opening Width2"(50 mm)
ThroatOpening
½" (13 mm)
½" (13 mm)
⁄"(8 mm)
2"(50 mm)2"(50 mm)
2"(50 mm)
9 ¾"(248 mm)
Equal
Equal
10 ⁄"(264 mm)
Finished Opening Height
HINGE
HINGE
HINGE
STRIKE
Optional 14 gauge closer reinforcement
Finished Opening Width
40 ⁄"(1024 mm)
Jamb
Depth
1 ⁄"
(49 mm)
Varies
⁄" (16 mm)
Opening Width
⁄"
ThroatOpening
½" (13 mm)
½" (13 mm)
2"(50 mm)
Frame sizing options
Series
Maximum opening size Jamb depth availability(profile)Standard profile dimensions (variations available)Corners
Single Pair
Narrow double rabbet Double rabbet Face Stop Returns StandardMin. Max. Min. Max.
MU16
4’0" x 9’0"
(1219 mm x 2743 mm)
8'0" x 9'0"
(2439 mm x 2743 mm)
3 1⁄4"
(83 mm)
4 3⁄8"
(111 mm)
4 1⁄2" (114 mm)20" (508 mm)2" (51 mm)5⁄8" (16 mm)1⁄2" (13 mm)
DIE MITERED with
interlocking Soffit tab
MU14
4’0" x 9’0"
(1219 mm x 2743 mm)
8'0" x 9'0"
(2439 mm x 2743 mm)
3 1⁄4"
(83 mm)
4 3⁄8"
(111 mm)
4 1⁄2" (114 mm)20" (508 mm)2" (51 mm)5⁄8" (16 mm)1⁄2" (13 mm)
DIE MITERED with interlocking Soffit tab
Frames • MU Series multi-use
Book Rev. 09/26/24 • Page Rev. 10/28/22 • Technical data manual • • 35
Standard hardware and corner conditions
Universal Mortise Hinge Prep
4 7⁄8" (124 mm) Standard
5" (127 mm)
Optional
7 Gauge Hinge Reinforcement
4 7/8" (124 mm) Strike Prep (ASA)
4 7⁄8 " (124 mm) Standard
KD Corner Detail
Optional 4" (102 mm) Head Detail
Notes
1. Variations in jamb depths available in 1⁄8" (3 mm) increments.
2. All MU Series frames are supplied standard with masonry wire or lock-in jamb anchors and adjustable base anchors. Anchors are
designed for maximum wall/frame engagement and installation flexibility.
3. MU Series frames are to be installed as part of the wall framing sequence.
4. Depending on environmental and usage conditions the steel can be either cold rolled or galvannealed. Galvannealed steel is recommended for all exterior applications.
5. MU Series with 4" heads are used mainly in masonry applications when 2" face heads do not match block coursing, or in drywall applications when installed in close proximity to a F Series or MU Series frame installed with a 4" head.
Frame options
Series
Frame profile Corner connections
4" (102 mm) HeadsKD (Knock-down)SUA (Set-up & weld)
Narrow double rabbet Double rabbet Single rabbet Double rabbet Single rabbet Double rabbet
MU16 Typically for walls less than 3 3⁄4" (95 mm) thick.
Minimum walls thickness = 2"
(51 mm)
Typically for walls 3 3⁄4 " (95 mm) thickness or greater.
Factory Die-Mitered, Soffit Tab included. Corner clip assembly screws required.
Available when specified, and in accordance with ANSI A250.8-2017.
Die-mitered for use with 2"
(51 mm) face jambs. Corner Clip assembly screws required.MU14
N/A - Not Available
Frames • MU Series multi-use
36 • • Technical data manual • Book Rev. 09/26/24 • Page Rev. 10/28/22
Standard anchoring
Wire Masonry Anchor
3⁄16" (5 mm) dia. wire
Existing Masonry Anchor
See note #6.
Adjustable Base Anchor
Attached with S.
M. screws (furnished)
Maximum adjustment 1 3⁄8" (35 mm) below frame
Anchor for Stud Partition
Lock-in anchor
Anchoring and installation notes
1. MU16 Series Multi-use flush frames are supplied standard with masonry wire, or lock-in jamb anchors and adjustable base anchors. Anchors are designed for maximum wall/frame engagement, and installation flexibility.
2. For anchoring options (e.g. Masonry T anchors) and applications, refer to
"Anchoring systems" on page 84.
3. Installation caution notice: Grouted frames:
• When temperature conditions necessitate an additive to be used in the mortar to prevent freezing, the contractor installing the frames must coat the inside of frames in the filed with a corrosion resistant coating per A250.11
• When frames are to be grouted full, silencers must be field installed prior to
grouting.
• Steel frames, including fire rated frames, do not require grouting. Grouting is not recommended for frames in drywall.
4. Installation shall conform to the published Steelcraft installation instructions, A250.11 Recommended Installation Instructions for Steel Frames.
5. All fire rated frames must be installed in accordance with NFPA Pamphlet 80 and the Authority Having Jurisdiction.
6. When using Standard Exiting Wall Anchors the anchor must be field modified
(notched) to provide clearance for the backbend return.
Framing applications
Series Steel type Building type Opening Usage frequency 1 KD Corner 4 SUA Corner 5 Applications
MU16
Non-Galvannealed 2 Institutional and Commercial
Interior Heavy to extra heavy duty
Typical building conditions
Galvannealed 3 Mainly Exterior High humidity and/or weather exposure
MU14
Non-Galvannealed 2 Institutional and Commercial
Interior Extra heavy to maximum duty
Typical building conditions
Galvannealed 3 Mainly Exterior High humidity and/or weather exposure
1 Usage frequency is based on ANSI A250.8-2017
2 Commercial quality carbon steel
3 Reinforcements for galvannealed frames are also galvannealed
4 Knock-Down for field assembly prior to installation
5 Set-up and Welded for installation as a pre-welded unit