Sapa Alumax ProLine PL70 User manual

INSTALLATION
INSTRUCTIONS
ProLine PL80
HEAVY FRAMELESS BYPASS
BATH ENCLOSURE
Copyright © Alumax Bath Enclosures 2013. All rights reserved.
G03980849
5-1-13


January12,2015
!WARNINGS!
INSTALLATION WARNINGS
a) Alumax Bath Enclosures by Sapa are intended to be installed by an experienced installer. If you need assistance with
locating an experienced installer, contact us at 1.800.643.1514 or go to our website www.alumaxshowerdoor.com to access
our “dealer locator”. If a dealer is not listed in your area, call or send us an e-mail and we will find one for you.
b) The enclosure must be properly installed per our published installation instructions. If NOT, the unit will not operate as
designed which will cause hardware failure, glass breakage, leaking, other unidentified issues, and may cause nullification
of warranty.
c) Unpack your unit carefully and inspect for freight damage. Lay out and identify all parts using the instruction sheets as a
reference. Before discarding the carton, check for small hardware bags that tend to fall into the bottom of the box. If any
parts are damaged or missing, refer to the descriptions noted in the instructions when contacting your dealer for
replacements.
d) Before beginning installation, check the tub rim for level and both walls for plumb. If either is off more than ¼” to 3/8”, you
should use a tapered filler which can be used to level the tub track or plumb the wall jambs.
e) Wear safety glasses when drilling or cutting to avoid injury to the eyes.
f) When drilling holes in ceramic tile or marble, use a center punch and hammer to carefully break the surface glaze so the
drill can start without skidding. A skidding drill can cause damage to the surface and can be dangerous (risk of personal
injury).
g) Use caution and proper technique whenever using tools to avoid damage to property and/or personal injury.
GENERAL USAGE AND HANDLING WARNINGS
a) Shower doors are not leak-proof. They are designed to direct water to the interior of the tub or shower under normal
conditions. Excessive water pressure or directing the shower head directly at the door can result in leaks.
b) Do not hang on towel bars or handles or use them to support your weight getting in and out of the bathtub or shower.
Towel bars and handles are not intended to be used as grab bars for assistance getting in and out of the shower or bathtub.
They are not intended to support a person’s weight and could break.
c) Do not use excessive force when opening and closing the enclosure. Excessive force can lead to glass breakage or other
damage to the enclosure. Make sure wall jamb bumpers are securely fastened in place per the installation instructions.
GLASS USAGE AND HANDLING WARNINGS
a) TEMPERED GLASS CANNOT BE CUT. Attempting to cut tempered glass will result in the glass breaking or shattering.
b) USE CAUTION WHEN HANDLING GLASS PANELS. Safety tempered glass is very resistant to breakage, but it can still
break if unequal pressure is placed on it during installation (or if cutting of the glass is attempted). In addition, the sharp
corners of the panels can damage tile and floor coverings or cause injury.
c) PROTECT THE EDGES OF THE GLASS. Never let the edge of the glass come in direct contact with concrete, tile, marble
or other hard surfaces that may nick, or damage the glass edge in any way as this damage may cause a delayed blow.
Always check the edge of the glass for nicks, slivers, rough areas, or clam shelling. Do not install the glass if these
conditions are present.
d) Alumax Bath Enclosures by Sapa is not liable for glass breakage of any kind.
CARE AND CLEANING WARNINGS
a) The simplest and preferred method of cleaning your unit is by washing it with clean water and drying with a soft cloth.
b) If soil is still present after drying, a non-abrasive cleanser with a pH of seven to eight may be used. Comet Bathroom
Cleaner® has been tested and is recommended by the Bath Enclosure Manufacturers Association (BEMA).
c) Contact your dealer for more information about glass coatings that will help keep the glass clean.
d) DO NOT USE SCOURING PADS, SHARP INSTRUMENTS, BLEACH OR ACID-BASED CLEANSERS TO CLEAN THE
UNIT AS THEY MAY DAMAGE THE UNIT.
LIMITED WARRANTY
a) Alumax Bath Enclosures by Sapa provides a LIMITED WARRANTY on material and workmanship only. Primary glass and
component suppliers must be included in all warranty claims.
b) Alumax Bath Enclosures by Sapa is not responsible for glass breakage.
c) Products must be handled, installed and maintained per our published Warning and Installation instructions or the warranty
may be nullified.
d) The Limited Warranty applies to the original owner only, and is not transferable.
e) Please visit our website www.alumaxshowerdoor.com or call us at 1.800.643.1514 to get copies of our published warranty,
installation and warranty policies.

Page 4 of 9
AWall Mount Anchor BWall Mount Block
C1/4 x 2 Truss Head Screw
DHeader Bar
EWall Mount Sleeve
FFixed Panel
GGlass Clip Anchor
HThreshold
IGlass Clip
JGlass Clip Screw
KGlass Clip Vinyl
LCenter Guide
MCenter Guide Anchor
NCenter Guide Insert
OCenter Guide Screws
PDoor Panel
QRoller Back Plate
RBack Plate Sleeve
SBack Plate Gasket
TMid Plate Gasket
UMid Plate
VRoller Plate
WRoller Screw
XAnti-Jump
YAnti-Jump Screw
ZGlass Mount Threaded Rod
AA 5/16" x 3/4" Socet Cap Screw
BB Glass Mount
CC Glass Mount Washer
DD Glass Mount Bushing
EE Glass Mount Cap
FF Stopper
GG Stopper Screw
HH Wall Mount Set Screw
I I Wall Seal
JJ Bulb Vinyl
KK Panel Seal
PL80 PARTS LIST

Page 5 of 9
Notes:
This is a two person installation.
All marks made on tile, marble or fiberglass should be made lightly in
pencil so they can be removed after the installation is complete. An
optional method is to use masking tape on the walls and sill that can be
removed as the installation progresses.
1
Establish Centerlines – The centerlines of the unit must be established
on the shower sill and on the walls as well. Measure the width of
the shower sill and mark the centerline down the middle. Transfer the
centerline to the walls using a level. Mark Header Bar [D] location at 2”
less than the unit height, on the centerline. Measure, and write down, the
distance between the two Wall Mount marks.
2
Bar Mount – Drill the Wall Mount holes 5/16”. Insert the Wall Anchors
[A] fully into the holes. Place the Wall Mount Blocks [B] against the
wall with the counter bore to the middle of the enclosure. Using the 1/4 x
2” Truss head screws [C], attach the Wall Mount Block to the wall, with the
slot in a vertical position and the screw centered in the block.
3
Bar Length - Measure the width of the fixed glass panel [F]. Subtract
2 3/8” from that dimension. Measure from the center of the middle
hole in the bar to the fixed panel end of the bar and cut that end off (The
fixed panel end is the one with the second hole in it). Now subtract
1 3/4” from the measurement taken in step 1, which is the overall
width of the shower opening at the top. Then take that measure
from the newly cut end of the bar to the uncut end and cut that
end off of the bar.
4
Level the Bar – Temporarily place the Wall Mount Sleeves [E] on each
end of the Header Bar. Align the Header Bar with the Wall Mount
Block, and slide the Wall Mount Sleeves over the Wall Mount Blocks. Place
a level on the center of the Header Bar and check for level. If needed the
Wall Mount Blocks can be raised, or lowered to make the Header Bar level.
Once leveled, remove the Header Bar from the Wall Mount Blocks, and the
Wall Mount Sleeves from the Header Bar. NOTE: A slight downward tilt
on the door side of the Header Bar will help keep the door in the closed
position while in use. A downward tilt on the Fixed Panel side will cause
the door to open, allowing water leakage.
FOOT PRINT - The width of the Door unit's base is 2 1/16"
Consider these measurements before drilling.
_
_

Page 6 of 9
5
Glass Clips and Threshold – Mark the center point of the sill,
along the centerline, established in step one. Make a mark
1/2” over toward the Fixed Panel [F] side and 15/16” outside
of the centerline. Make another mark 2” over from the wall and
15/16” outside of the centerline. Drill a 1/4” hole at each of these
marks. Clean the area around the holes and put a little silicone
into each hole. Press the Glass Clip Anchors [G] into the hole until
fully seated. Measure the sill width at the centerline, and cut the
Threshold [H] to that dimension. Place the Threshold on the sill next
to the Clip holes. Transfer the Glass Clip [I] hole locations on the
sill over to the Threshold. Notch or drill a 3/8” hole in the Threshold,
for the Glass Clip Screws [J] to pass through. You can also cut
about a 3/8” section out of the threshold at each location. Place the
Threshold on the sill and place the Glass Clips over it, at the correct
locations. Align the Threshold so that it is straight. Tape it down in
a few spots and lightly trace the inside edge. Remove the tape,
Threshold and Glass Clips. Run a bead of caulk, approximately
1/8” outside of the mark you just made. Replace the Threshold and
fasten the Glass Clips to the sill. Install the Vinyl Inserts [K] into the
Glass Clips. CAUTION: Tape the threshold down to keep it from
being moved during the rest of the installation.
6
Center Guide – Make a mark on the centerline approximately 1
1/2” toward the door side. Place the Center Guide [L] on the
new mark, centered on the mark. Mark the center of the attachment
holes and, remove the Center Guide. Drill two 5/16” holes at the
center guide attachment locations. Clean the area around the
holes and put a little silicone into each hole. Press the Center
Guide Anchors [M] into the holes until the lip is flush with the sill.
IMPORTANT: Make sure that the lobe on the Center Guide Insert
[N] is engaged with the proper slot in the Center Guide, as shown.
Mount the Center Guide with the Center Guide Screws [O].
c
L
Minimum 1.5" from outside
edge of curb to of Door

Page 7 of 9
7
Door Panel – Mount the roller assemblies to the Door Panel
[P], making sure that the Roller Back Plate [Q], the Back Plate
Sleeve [R] and the Back Plate Gasket [S] are to the outside. The
Back Plate Gasket has the large holes. Place a Mid Plate Gasket
[T] and the Mid Plate [U] on the inside of the glass and secure
the Roller Plate [V] to the entire assembly with the Roller Screws
[W]. Set aside the Anti-Jump [X] piece and Anti-Jump Screws [Y]
until after the door has been mounted to the header Bar. Install
your handle option at this time. Place the Door Glass inside the
shower enclosure with the Rollers facing out and the handle so that
it is on the side of the enclosure that the door will strike against.
CAUTION: Make sure that you set the Door Glass on something
so that the glass and/or the floor of the enclosure are not damaged.
Cardboard packing material works fine.
8
Load the Bar – Place the Fixed Panel [F] on a flat surface with
the mounting holes hanging off the edge, and the inside of the
panel facing down. Place the Header Bar [D] on the Fixed Panel
with the holes facing up. Using a thin rod, or straightened wire
coat hanger, push the Glass Mount Threaded Rods [Z] into the end
of the Header Bar and line one up with each hole in the bar. Put
a 5/16” x 3/4” Socket Cap Screw [AA] through the Glass Mount
[BB] and snug it down into a rod inside the Header Bar (DO NOT
TIGHTEN). Place a Glass Mount Washer [CC] on top of the Glass
Mount. Repeat for the other hole. Place a Glass Mount Bushing
[DD] on each of the Glass Mount Caps [EE]. Move the Header
Bar below the glass panel and Line the middle hole of the bar
up with the hole located 1 1/2” from the edge of the Fixed Panel.
Thread the Wall Mount Caps onto the Wall Mounts until Snug (DO
NOT TIGHTEN) Place a Stopper [FF] on both ends of the Header
Bar with the rubber bumper on each facing the middle of the bar
(oriented as shown). Slide them toward the middle and snug the
Stopper Screw [CC] (DO NOT TIGHTEN). Slide a Wall Mount
Sleeve [E] on both ends of the Header Bar, and snug one Set
Screw [HH] (DO NOT TIGHTEN). NOTE: There are two flat surfaces
on the Wall Mount Sleeve, one is on the end of the sleeve and that
goes towards the end of the Header Bar, and the other is on the
side of the sleeve and that one goes between the Fixed Glass and
the Header Bar.

Page 8 of 9
9
Fixed Panel Installation - Install the “peel-and-stick”
Wall Seal [I I] on the wall side edge of the Fixed Panel.
Orient it with the open end to the inside of the enclosure.
Lift the Fixed Panel and set it in the Glass Clips with the
edge as tight to the wall as possible. Loosen the Set
Screws in the wall mount sleeves and slide them over the
Wall Mount Blocks. Snug the Set Screws into the block
(DO NOT TIGHTEN).
10
Door Panel Installation – Lift the Door Panel [P]
and place the rollers on the bar, making sure to
get the bottom edge of the Door Glass into the Center
Guide. To adjust the door glass height, Adjustments must
be made to the Bar height. Adjustments can be made in
the wall mount blocks (See step 4) as well as the Glass
Mounts. Once you have the Header Bar set as you want
it, and the Fixed Panel positioned correctly, tighten the
Wall Mount Set Screws, then the Glass Mount Screws and
Caps. CAUTION: Do not remove both Glass Mount
Caps at the same time. Install the anti-Jump [X] and
Anti-Jump Screws [Y] on both Roller Assemblies.

Page 9 of 9
11
Seal Installation – Cut the Bulb Vinyl [JJ] and the
Panel Seal [KK] to the vertical length of your Door
Glass. Press the Bulb Vinyl on the strike side of the Door
Glass and the Panel Seal on the other, below the Header
Bar. A small amount of silicone can be used between the
glass and seal if you like.
12
Set the Stops – Move the door to the closed
position. Slide the Stopper [FF] over until it touches
the bottom of the roller on the strike side of the door,
making sure that the bottom of the stopper will clear the
top of the door glass. Tighten the Stopper Set Screw [GG.
Move the door to the open position with the handle 1/4” -
1/2” from hitting the fixed panel. Slide the other stopper
over until it just touches the bottom of the roller on the fixed
side of the door. Tighten the Stopper Set Screw.
13
Finishing Up – Make sure that all fasteners are tight.
Clean all exposed marks you made on the sill and
walls of the shower stall. Clean the glass panels.
14
Allow 24 hours for any silicone to completely cure,
before using your new Alumax Shower Door.

INSTALLATION
INSTRUCTIONS
ProLine PL60 - PL70 - PL80
OPTIONAL RETURN PANEL
Copyright © Alumax Bath Enclosures 2013. All rights reserved.
G03000000
7-1-13

Page 2 of 7
August 18, 2014
Three-Year Limited Residential Warranty
Alumax Bath Enclosures by Sapa is pleased to warrant to its dealers and residential customers that the
products supplied by it shall be free from defects in material and workmanship for three (3) years from
purchase of the product, provided they are installed and maintained according to the manufacturer’s
recommended practices and installation instructions.1The Alumax Limited Warranty applies to the original
residential owner only, and is not transferable.
Proof of Purchase and/or Registration of the product required for warranty coverage.
Registration instructions accompany the product or available at www.alumaxshowerdoor.com.
What Will Alumax Do?
Alumax will repair or replace, at its discretion, any product found to be defective in material or
workmanship during the applicable warranty period. Labor is not included. In the case of discontinued
products subject to warranty coverage, Alumax reserves the right to substitute comparable product of
equivalent function.
What is Not Covered?
This limited warranty applies only to materials and workmanship supplied by Alumax. This limited warranty
does not cover glass (claims of glass breakage are excluded) or outside fabrication provided by others. It
excludes all wear items and does not cover defects caused by improper installation of the product. Laws
and building and safety codes governing the design and use of bathrooms vary widely. Alumax does not
control the selection of product, configurations, operating hardware or glazing materials, and assumes no
responsibility for such.
ALUMAX DOES NOT MAKE ANY OTHER REPRESENTATIONS OR WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY
OR ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. TO THE EXTENT ANY
IMPLIED WARRANTIES ARE IMPLIED UNDER STATE LAW, SUCH WARRANTIES ARE LIMITED TO
THE DURATION OF THE APPLICABLE LIMITED WARRANTY TIME FRAME OF THREE (3) YEARS.
IN NO EVENT SHALL ALUMAX BE LIABLE FOR SPECIAL, DIRECT, INDIRECT, OR
CONSEQUENTIAL DAMAGES, INCLUDING, BUT NOT LIMITED TO, LOSS OF USE OR PROFITS,
PERSONAL INJURY, OR DAMAGE TO OTHER PROPERTY.
Some states do not allow the exclusion or limitation of implied warranties, or the exclusion or limitation of
special, incidental or consequential damages, therefore these limitations and exclusions may not apply to
you.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to
state.
How do You Get Warranty Assistance?
To make a claim under the terms of this Limited Warranty, contact your local Alumax Dealer or call or write
Alumax Consumer Service at 800-643-1514, 248 W. Greene St., Magnolia, AR 71753. Proof of Purchase
and/or Registration of the product is required for warranty coverage.
1The manufacturer’s recommended practices and installation instructions are available at www.alumaxshowerdoor.com, by
contacting your local Alumax Dealer, or by calling or writing Alumax Customer Service at 800-643-1514, 248 W. Greene St.,
Magnolia, AR 71753.

Page 3 of 7

4292779.1
!WARNINGS!
AlumaxBathEnclosuresbySapaareintendedtobeinstalledbyexperiencedinstallers.  Ifyouneedassistancewith
installation,orlocatinganexperiencedinstaller,contactAlumaxConsumerServiceat800‐643‐1514.  Ensurethatthebath
enclosureisinstalledappropriately.Improperinstallationcanleadtobreakage,damageorimproperperformanceofthebath
enclosure.
Wearsafetyglasseswhendrillingorcuttingtoavoidinjurytotheeyes.
Whendrillingholesinceramictileormarble,useacenterpunchandhammertocarefullybreakthesurfaceglazesothedrill
canstartwithoutskidding.Askiddingdrillcancausedamagetothesurfaceandcanbedangerous(riskofpersonalinjury).
Usecautionandpropertechniquewheneverusingtoolstoavoiddamagetopropertyand/orpersonalinjury.
Showerdoorsarenotwater‐tight.  Theyaredesignedtopreventleaksundernormalshowerconditions.  Excessivewater
pressureordirectingtheshowerdirectlyatthedoorcanresultinleaks.
Donothangontowelbarsorhandlesorusethemtosupportyourweightgettinginandoutofthebathtuborshower.Towel
barsandhandlesarenotintendedtobeusedasgrabbarsforassistancegettinginandoutoftheshowerorbathtub.They
arenotintendedtosupportaperson’sweightandcouldbreak.
Donotuseexcessiveforcewhenopeningandclosingshowerdoors.  Excessiveforcecouldleadtoglassbreakageorother
damagetotheenclosure.
!GLASSWARNINGS!
TEMPEREDGLASSCANNOTBECUT.Attemptingtocuttemperedglasswillresultintheglassbreakingorshattering.
USECAUTIONWHENHANDLINGGLASSPANELS.Safetytemperedglassisveryresistanttobreakage,butitcanstillbreakif
unequalpressureisplacedonitduringinstallation(orifcuttingoftheglassisattempted).Inaddition,thesharpcornersof
thepanelscandamagetileandfloorcoveringsorcauseinjury.
BEFOREBEGINNINGINSTALLATION
Unpackyourunitcarefullyandinspectforfreightdamage.  Layoutandidentifyallpartsusingtheinstructionsheetsasa
reference. Beforediscardingthecarton,checkforsmallhardwarebagsthattendtofallintothebottomofthebox.Ifany
partsaredamagedormissing,refertothedescriptionsnotedintheinstructionswhencontactingyourdealerfor
replacements.
ToinstallyourAlumaxBathEnclosurebySapa,youwillneedthefollowing:tapemeasure,level,#2Phillipsscrewdriver,flat
screwdriver,drill,1/8”,7/64”and3/16”drillbits,hacksaw,pencil,andcaulking(clearsiliconerecommended).Optionaltools
includeamiterboxforcuttingpartstolength,files,centerpunchandmaskingtape.
NOTE:Beforebeginninginstallation,checkthetubrimforlevelandbothwallsforplumb.Ifeitherareoffmorethan¼”to
3/8”,youmaywanttocontactyourdealerfortaperedfillerswhichcanbeusedtolevelthetubtrackorplumbthewalljams.
CAREANDCLEANING
Thesimplestandpreferredmethodofcleaningyourunitisbywashingitwithcleanwateranddryingwithasoftcloth.
Ifsoilisstillpresentafterdrying,anon‐abrasivecleanserwithapHofseventoeightmaybeused.CometBathroomCleaner®
hasbeentestedandisrecommendedbytheBathEnclosureManufacturersAssociation(BEMA).
DONOTUSESCOURINGPADS,SHARPINSTRUMENTS,BLEACHORACID‐BASEDCLEANSERSTOCLEAN
THEUNITASTHEYMAYDAMAGETHEUNIT.


Page 4 of 7
ASC-658 Wall Jamb
B* Wall Jamb Screw
C* Wall Jamb Anchor
DGlass Clip Anchor
EReturn Threshold
FGlass Clip
GGlass Clip Screw
HGlass Clip Vinyl
IGlass Return Panel
* Not Supplied by Alumax
PL RETURN PARTS LIST

Page 5 of 7
Notes:
This is a two person installation.
All marks made on tile, marble or fiberglass should be made lightly in
pencil so they can be removed after the installation is complete. An
optional method is to use masking tape on the walls and sill that can be
removed as the installation progresses.
1
Establish Centerline – Lightly, mark the centerline of the unit on the
sill and up the walls of the shower stall.
2Wall Jamb Installation Preparation – Cut the SC-658 Wall Jamb [A] to the unit height minus 1/8”. Drill three holes along the center of the
channel of sufficient size to clear the Wall Jamb Screws [B] (not supplied
by Alumax) you are using to mount the Wall Jamb to the wall. There is a
v-groove down the middle of the channel on the inside of the profile to
help keep the holes centered. Drill one hole in the middle and the other
two should be drilled six inches from each end. Countersink the holes if a
flat head screw is being used.
3Mark the Wall Jamb Location – Place the SC-658 Wall Jamb [A] against the return wall with the holes lined up with the centerline
marked in Step 1, and raise it up 1/8”. Mark the center of all 3 holes on
the centerline. Remove the wall jamb and drill all 3 locations for the Wall
Anchors [C] (not supplied by Alumax) you are using to mount the wall
jamb. Clean the holes. Insert the wall anchors, but do not install the wall
jamb at this time.

Page 6 of 7
4
Return Clip Location - Mark the return centerline
approximately three inches from the wall and the front
centerline. Drill both locations 9/32”. Clean the holes and sill of
debris, squirt a little silicone into the holes and insert the Glass
Clip Anchors [D].
5
Threshold and Clip Installation – The Return Threshold [E]
will need to be miter cut on one end, to meet up with the
front threshold, and square on the other. Shown is the miter
cut for a left hand return panel. The finished length varies
depending on the unit being installed. For a PL60 or PL80 it
is the return centerline plus 1-3/8”. For a PL70 the length is
the return centerline plus 1-1/16”. Once properly cut place
the Return Threshold on the sill next to the holes you drilled in
step 4 with the square end against the return wall. Transfer the
hole locations to the threshold. Notch or drill a 3/8” hole for
the screws to pass through. Place the threshold on the sill and
place the Glass Clips over it, aligned with the holes. Tape the
threshold in place and lightly trace the inside edge. Remove
the tape, clips and threshold. Run a bead of caulk on the
bottom of the Threshold and replace it on the sill, using the
marks to line it up. Install the glass clips over the threshold
using the Glass Clip Screws [G] provided. Install the Glass Clip
Vinyl into the clips.
6
Wall Jamb Installation – Mount the SC-658 Wall Jamb
[A] to the return wall, making sure that it is on top of, and
inside the threshold.

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7
Return Panel Installation – You will need a light mark outside
of the centerline, to determine where the outer edge of
the Glass Return Panel [I] is. The mark should fall on the miter
cut in the threshold. For a PL60, that mark should be 1-3/16”.
For a PL70 the mark should be 7/8”. For a PL80 the mark
should be 1-1/8”. Orient the Glass Return Panel so that the
return mount hole is toward the front of the enclosure. Slide the
vertical edge of the glass into the SC-658 wall jamb. Line up
the outside, vertical edge with the mark you just made and set
the bottom edge of the glass into the Glass Clips.
8
Install the return mount through the hole in the return glass
panel. A PL60 return mount is shown, for reference.
Things to Remember – There are two things to take into account during the installation of the “front” of the
shower door.
• There will only be one wall mount bracket used. The other support for the header bar being the return
mount (step 8).
• The threshold for the front of the shower door will be longer than described in the standard installation
instructions, and will need to be miter cut to match the return threshold. To determine the length of the
front threshold, measure the width from the wall, to the pointed tip of the return threshold. Cut the front
threshold to that length, and proceed as described in the standard installation instructions.