Hidden Drainage Window Systems for Architectural Excellence

Traditional weep holes fail during storms because positive external wind pressure forces water back up the weep path into the frame. Zenic’s hidden drainage system uses an isobaric pressure-equalization chamber. By equalization of atmospheric pressure inside the drainage channel with the outside environment, wind pressure cannot push against the water column. Rain drains vertically downward under gravity through concealed channels inside the sub-frame sill, featuring one-way internal gravity baffles that block reverse airflow.

Exposed plastic weep covers deteriorate under prolonged ultraviolet (UV) solar exposure, leading to yellowing, embrittlement, wind detachment, and unsightly aesthetic gaps across the facade. Zenic’s hidden drainage window systems eliminate plastic weep caps entirely. All drainage channels are CNC-milled inside the sub-frame aluminum profile and discharge water invisibly at the underside drip profile, creating a 100% durable, UV-immune powder-coated aluminum surface.

No. Zenic engineers place the pressure-equalized hidden drainage channels strictly within the outer cold-zone profile chamber, located outside the primary polyamide (PA66 GF25) thermal barrier strip. The internal dry chamber and warm interior profile remain fully insulated and sealed with continuous EPDM gaskets, allowing our systems to achieve U-values down to 1.1 W/m²K while delivering maximum water tightness.

Zenic hidden drainage profiles feature built-in aluminum debris screens and internal gravity baffle valves. The vertical drop design uses gravity siphon action, which flushes fine dust through the outlet naturally during rain. For periodic maintenance, the lower flush drip channels can be rinsed with a water hose or blown clear with compressed air without needing to disassemble the window sashes.

Yes. As a direct manufacturer in Foshan, Zenic Window & Door Technology Co., Ltd. provides full OEM/ODM engineering services. We design custom aluminum profile extrusion dies, engineer customized concealed drainage sub-frames for integrated curtain wall systems, and offer over 200 RAL powder coat, anodized, and wood-grain surface finishes tailored to your architectural project requirements.

Our baseline MOQ starts at 50 pieces per custom project order. You can mix casement windows, tilt-and-turn units, fixed glass frames, and sliding patio doors within one container shipment to reach the MOQ. Typical production lead time is 15 to 25 days following final shop drawing approval and deposit confirmation. Goods ship FOB Foshan or Shenzhen in sea-worthy fumigated plywood crates.

Depending on the system series and destination market, Zenic window and door systems are certified or tested to NFRC (North America), CE (Europe), AS2047 (Australia), AAMA (USA), CSA (Canada), and ISO 9001 quality management standards. Full test reports and engineering calculation packages are provided for municipal building permit approvals.