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Windows are reflective. When sunlight hits a surface, such as window glass, it sometimes reflects onto another object. The amount of sunlight reflected by the window glass is increased when it has a Low-E coating, which is purposely designed as an energy-saving device to decrease the amount of sunlight entering a home. The reflection of sunlight off glass with Low-E indicates the window is doing its job.
For more information, see MI’s Information Statement on Solar Energy Reflection.
A Window Opening Control Device (WOCD) is an option available for some MI windows designed to restrict the opening of a sash to less than 4" to lessen the risk of accidental falls. A WOCD can be released to allow the sash to fully open for emergency escape and rescue. Some IRC and lBC editions have minimum sill height requirements for certain window openings, with use of a WOCD as one exception. Building codes vary by jurisdiction: consult your local code to determine if a WOCD is appropriate for your application.
WOCDs are effective only if properly installed and remain engaged except in cases of emergency. Installers should follow MI installation instructions. Occupants should be familiar with and follow MI's important safety information. MI's WOCDs have been tested for compliance with ASTM F 2090.
MI offers a WOCD for the following windows:
Factory Installed WOCD: 3500, 4300, 1650, 1555, 1556, Western Region 5500 & 5800 (can only be applied with equal sightline adapter)
Aftermarket WOCD (installed in the field): 3500, 4300, 9700, 1675, HM147, EC147, Southern Region 5500
Note: A WOCD can be applied and replace a nite latch on the 1650, 1555, or 1556.
The answer will vary depending upon several factors, including, but not limited to, the characteristics of your old and new windows, house size, geographic location and personal use. ENERGY STAR® has calculated some estimates for replacing single-pane or double-pane clear glass windows with ENERGY STAR qualified windows. Ask your builder, contractor, or distributor for information on MI windows bearing the ENERGY STAR label.
Visit ENERGY STAR for more information.
In many areas of the United States, strong wind and fine soils create issues regarding dust infiltration, which can affect all fenestration products (i.e. windows and doors). Even when closed and locked, all operational window and door products can experience air infiltration because the operating component is designed for movement (i.e. the operational sash). Air infiltration occurs as air under pressure enters the home, which may occur through certain points on a locked window. The operating components have weatherstripping to reduce air infiltration, but it is not feasible to eliminate all air leakage due to the operational function of the window. Windows with these characteristics routinely meet the common industry standard.
Dust infiltration is found at these operating points; usually when winds exceed residential standards of twenty-five miles per hour. Also, high winds may cause a slight deflection of the sash component allowing the opportunity for dust particles to be forced into the home. Please note: if excessive dust is allowed to build up on the exterior sill between the sash and screen, even normal wind pressures will force dust inside the home.
Dust infiltration is most prevalent in arid regions, new construction areas, and farming areas. Once landscaping is established and the amount of dust particles are reduced in the air, problems often decrease substantially. Below are tips on how to reduce dust infiltration.
Tips for Controlling Dust Infiltration
1. Remove excessive dust on the sill outside of you window between the sash and screen as often as necessary to prevent build up.
2. Establish a lawn as quickly as possible.
3. Use mulch and water flowerbeds around the home.
4. Clean the bottom sash weatherstrip periodically to insure a tight seal on the sill of the window.
Window and door manufacturers are required to test their products to meet industry standards for air infiltration, water intrusion, and structural integrity. These tests have parameters that must be met for the window to become certified. The products, which achieve certification, are then labeled to reflect their compliance in meeting these standards. MI Windows and Doors tests its products to meet those standards.
The terms "Design Pressure" (DP), “Structural Test Pressure” (STP), and "Performance Grade" (PG) have in the past been loosely used by some in the field, when in fact they have different meanings.
Design Pressure and Structural Test Pressure are strictly structural testing qualifications, irrespective of the results of any air leakage resistance testing or water penetration resistance testing. The Performance Grade of a product is limited by the lowest/least performance of its structural, air leakage resistance, or water penetration resistance test results; operating force and/or forced-entry resistance requirements may also apply.
More specific definitions of these terms are defined by the American Architectural Manufacturer’s Association (AAMA):
Design Pressure (DP) – “A rating that identifies the load, induced by wind and/or static snow, that a product is rated to withstand in its end-up application. Loads induced by static snow are applicable only to unit skylights, roof windows, and [tubular daylighting devices (TDD)]”. (AAMA AG-13)
Structural Test Pressure (STP) – “The overload pressure differential applied to a window, door system, TDD, [secondary storm product (SSP)], or unit skylight.” (AAMA AG-13) The structural test pressure is 150% of the design pressure for windows and doors.
Performance Grade (Grade or PG) – “A numeric designator that defines the performance of a product in accordance with [AAMA 101/I.S.2/A440] … Performance grade (PG) is achieved only upon successful completion of all applicable tests specified in Clause 9 [of 101/I.S.2/A440-11].” (AAMA AG-13)
Our measurements for new construction windows are in feet. For example, the 3050 stock size would be 3 ft x 5 ft or 36" x 60".
The size guides can be found for some of our new construction products on our website. For replacement windows, we do not have stock sizes and all of the measurements are in inches. If you see a replacement window size of 28x42, that would be 28"x42".
Both of these measurement listings are pretty much industry standard.
Note: If your existing windows have a nail fin, the size of the window does not include the fin. It is the tip to tip frame size. On most vinyl windows, the fin extends 1 ½” past the frame all the way around the window, so to find the tip to tip fin size you would add 3” to the frame size.
The key to proper window installation is to think beyond the actual act of installing. There are steps you can take both before and after the installation to ensure proper function and performance of your windows.
First, be sure the rough opening has been properly prepped - is clean and smooth and the proper size. Before windows are installed, be sure the installer reads any and all installation instructions thoroughly and notes any special care to be taken with the windows. Often, manufacturers have their own set of instructions in addition to the ASTM E2112 Standard Practice for Installation of Exterior Windows, Doors, and Skylights. Additionally, make sure all materials are on-hand and compatible with the product. Check with the proper resource to gather a list of materials (including flashing, sealant, etc.) that is compatible with the product you purchased.
After the installation is complete, if there is more work to be done, use extra caution around the job and make sure it's not disturbed. Keep in mind that any contact with the window that happens between the installation and finalization could possibly affect the original work. Lastly, take great care with any final caulking or trim work.