The invention relates to an access panel configured for fixing to a service aperture in a wind turbine tower wall; wherein the access panel comprises a main panel and an adjacent sub-panel; the sub-panel comprising a bearing surface at an edge thereof; the main panel comprising a reference surface at an edge thereof; the main panel and the sub-panel being abuttable along a common seam; the seam comprising a said sub-panel bearing surface abutting a main panel reference surface; the main panel being dimensioned to close a main region of a tower wall aperture whereas the sub-panel is dimensioned to close a first sub-region of the aperture. The invention includes a method according to which the sub-panel is placed into a tower wall aperture and adjusted to bring its bearing surface into a predetermined position. Thereafter, a main panel is placed in the aperture with its reference surface in abutment with the bearing surface, thereby quickly and easily and reliably locating the main panel for securely fixing in the tower aperture.

A mulling system includes a first joining plate with a first plate member, a second plate member, and a first thermal breaker that extend longitudinally along a mulling axis with the first thermal breaker attaching the first and second plate members. The mulling system includes a second joining plate that includes a third plate member, a fourth plate member, and a second thermal breaker that extend longitudinally along the mulling axis with the second thermal breaker attaching the third and fourth plate members. The second joining plate attaches to the first joining plate to join together first and second fenestration units with the mulling axis extending between the first and second joining plates. The first joining plate matches the second joining plate to define a corresponding rotated and engaged arrangement of the first joining plate and the second joining plate across the mulling axis.

An apparatus and a method for mulled window installation are described. An example window apparatus includes a mullion tube, a first window unit attached to a first side of the mullion tube, a second window unit attached to a second side of the mullion tube, a first mull clip disposed inside a first hollow end of the mullion tube, and a second mull clip disposed inside a second hollow end of the mullion tube. The first mull clip defines a first hole configured to receive a first screw through a first cutout in the mullion tube, and the second mull clip defines a second hole configured to receive a second screw through a second cutout in the mullion tube.

A mulling system for a plurality of fenestration units includes a first joining plate configured to attach to a first outer edge of a first fenestration unit. The first joining plate includes a first outer face. The mulling system also includes a second joining plate configured to attach to a second outer edge of a second fenestration unit. The second joining plate includes a second outer face. The second joining plate is configured to engage the first joining plate to join together the first fenestration unit and the second fenestration unit with the first outer face facing the second outer face. The mulling system additionally includes a deflectable seal member attached to the first joining plate and having a sealing surface that faces away from the first outer face. The sealing surface is configured to deflect and seal against the second outer face of the second joining plate.

Disclosed is a system of interlocking door frame and wall panels for modular building units. Both the door frame panel and the wall panels are provided for easy installation into the skeletal frame of the modular building unit, and are provided with mating male and female connecting edges on opposite sides of each panel. This allows the door frame panel to mate with an adjacent wall panel in the same manner in which adjacent wall panels mate with one another, ensuring a clean, finished appearance for the connecting edges, a strong, reinforced frame having long durability, and a connection having the same physical, structural integrity as the connections between adjacent wall panel units. The door frame panel itself is particularly configured to receive a traditional, commercially available steel door frame and door assembly, but allows fitment of such commercially available steel door frame and door assembly without cutting a wall panel to receive that frame.

A spacer profile comprises: a basic body extending in a longitudinal direction of the profile with an outer contour which is substantially rectangular or trapezoid-shaped in a cross-section perpendicular to the longitudinal direction; the body comprising first and second transverse walls connected by a single side wall element and held at a pre-set spacing h; the side wall element ending with a first end at a first edge region of the first transverse wall and with a second end at a first edge region of the second transverse wall; the side wall element forming a path for thermal conduction from the first transverse wall to the second transverse wall, the path length approximately 1.1 or more times the spacing h; and comprising an anchoring protrusion held on the first transverse wall and extends from the body in a direction opposite to the second transverse wall.

An airloop window wall system with solar energy units integrated into the window wall panels is disclosed. The disclosed system provides electrical connections between adjacent solar energy window wall panels without compromising the window wall watertightness performance and permits easy replacement of solar energy units from the building interior.

A mulling system includes a stiffener member that is disposed between a first fenestration unit and a second fenestration unit. The stiffener member extends between a first side and a second side of the fenestration assembly. The stiffener member abuts a first frame member of the first fenestration unit and a second frame member of the second fenestration unit. The mulling system also includes a cover member that attaches to the stiffener member on a side. The cover member covers over the first frame member, the second frame member, and the stiffener member to conceal the mull joint on the side.

A mulling system includes a first corner member that attaches together a pair of first frame members. The system also includes a second frame member and a stiffener member that is layered between one of the pair of first frame members and the second frame member. The stiffener member abuts the one of the pair and the second frame member. Moreover, the system includes a cover member that attaches to the stiffener member on the first side to at least partly conceal the mull joint on the first side. Also, the system includes a fastener that attaches the first corner member, the one of the pair of first frame members, the stiffener member, and the second frame member.

Compound fenestration assembly mull joints including one or more mull end connectors, compound fenestration assemblies using those mull joints, and methods of making and using the same are described herein. The compound fenestration assembly mull joints including one or more mull end connectors described herein are configured to be attached to the building opening using a flowable bonding agent (in addition to attachment of the fenestration units to the building openings).