Single Hung Window: A window consisting of a vertically sliding sash which utilizes a counterbalancing device to allow the bottom sash to be opened to any variable position between its fully opened to fully closed limits. Also be referred to as a Vertically Sliding Window. Advantages of the single hung design are less operating hardware to maintain, less lineal footage of sash crack thus generally achieving a greater air and water resistance. By the top glass being glazed into the frame, one can expect a tighter and stronger final product vs. other type of hung window products.

Double Hung Window: Window consisting of two vertically sliding sash which utilize a counterbalancing device to allow the sash to be opened to any variable position between their fully opened to fully closed limits. Also be referred to as a Vertically Sliding Window. Advantages are that top sash may be dropped for indirect ventilation or both sash opened for increased air circulation. With both sash removed, the remaining opening is larger and unobstructed, which comes in handy. Typically, a double hung can offer a consistent vertical site-line between top and bottom sash, which is often desirable for historic replication and/or renovations.

Horizontal Sliding Window: A window that consists of one or more sash that slide horizontally within a common frame and may also contain fixed light / sash. Typically the operating sash is indicated with an "X" and the fixed are indicated with an "O". Thus an XO would be an operable left sash ( as viewed from exterior ) with a fixed light to the right side. Sometimes a three panel / sash slider is referred to as a Picture Slider and commonly has the center light / sash fixed and either all sash are one-third the units width or the fixed sash is 50% of the width, with the operable sash then each at 25% of the width.

Fixed Light Window: Not to be confused with or used in lieu of Skylights and/or Tubular Day-lighting Device ( TDD ), a fixed window is designed to be non-operable and consists of an outer frame which receives glass directly ( no sash ) or some fixed lights can receive a separate inoperable glazed sash. Advantages for use of fixed lights are greater security due to being non-operating and they are considerably more efficient in terms of water and/or air resistance. Without moving parts, maintenance is also considerably less with periodic cleaning the only main issue. Fixed lights are often sold as companion products to single hung, double hung, horizontal sliders and projected type windows. They are often stacked above to serve as a transom, mulled beside hung and/or sliders to offer greater vision area at minimal cost or can be placed below for increased lighting while keeping the operable sash at more favorable levels.

Blast Resistant Windows: Seal Craft offers three product types; single hung, horizontal sliding and fixed lights that have been tested to meet or exceed the Unified Facilities Criterion ( UFC ), ASTM's F1642 and GSA requirements. These type windows used to be referred to as meeting "Anti Terrorist / Force Protection" ( ATFP ) requirements. Due to the sensitive nature of these type jobs and a multitude of very project specific requirements, we will not publish the pertinent product data here, but ask that you contact Seal Craft or our authorized representative for more specific details on blast resistant windows. The Seal Craft products that are blast resistant have a "BR" suffix.

Impact Resistant Windows: Also referred to as "hurricane resistant windows", Seal Craft offer various products that meet or exceed the industry standards of AAMA 506, ASTM E-1886-05 and ASTM E-1996. Testing was conducted to the Missile Level D, commonly referred to as the "large missile" testing and we test to the level of Wind Zone 4. These Impact Resistant products are typically specified for use in coastal regions or for projects within a moderate distant "off the beach". Large missile testing is typically required for any window used at grade level through the third or fourth floor. Check the Building Codes for the requirements for your Project's specific location. The Seal Craft products that are impact resistant have an "IM" suffix.

Historical Window: Actually, there is no sanctioned Grade or Type of Historical Window. What meets the aesthetical or functional requirements in one geographical region may not satisfy the requirements in another. Typically, what differentiates a Historical Window from a non-historical is the accessories. Examples being the type and placement of muntin bars, which are intended to simulate the smaller individual lites of glass. Secondly, the items used around the perimeter of the exterior and/or interior frame are produced to emulate the old / original style exterior wood brick mouldings and/or interior wood sanitary stops and casings. These, of course, varied widely on a region basis. Seal Craft takes pride when working on the Nations Historical Renovations and has several of these custom profiles to select from, or we would be happy to visit the site to take photographs and detailed measurements in an effort to emulate the architectural detail as closely as possible for your specific project. Custom painted finishes highlight the windows' features with patina and dark greens being very popular finishes.

Hotel Window: Also referred to as a "window with louver" or "window over louver", these windows are designed primarily for use in hotel / motel construction. As the nicknames imply, this is a window above a free-air louver. The louver is functional and visible from the exterior, but is behind the packaged transformer & air conditioning (PTAC) unit from the interior / room side. Seal Craft offers a single hung, horizontal slider or fixed light above the louver. These are typically built as an integral jamb system, meaning that the verticals of the frame run through, uninterrupted, from sill to head. Typically the frames include an integral nail-fin at all four sides. Should your design call for a sub-sill, Seal Craft offers you a tank-type sub-sill with matching nail fin and finned end-dams. These fins serve as an installation index.