Hi-Hatch ASCeiling Access Hatch

Single frame type with outer frame hidden. Having simple airtightness performance.
300×300, 450×450, 600×600

Installation Location

  • Ceiling

Main Features

  • Single Frame with Outer Frame Hidden
  • A-3 Grade Simple Airtightness Performance
  • Can after Construction
  • Can Install into Wooden Frame
  • (Corp.) Public Buildings Association Evaluating Product



  • 300×600(mm)
  • 450×450(mm)
  • 600×600(mm)

Opening and Closing Part

  • Standard Type

  • Key Type (Key P201)

    Can Key Sharing with MMⅡf, MMHⅡ, GMⅡ, SEⅡ, AS, NT, GS

Color Variation

  • White Color (Baked Coating)

  • Silver Color


Airtightness Performance


Test Standard JIS A 1516-1994
Test Model: HHAS-303, 606

Test Results

A-3 Grade

Airtightness grade and airtightness grading line conform to JIS A 4706 (sash).

*Data are our test values and not guaranteed values.



Outer Frame, Inner Frame, Slide Angle/ Extruded Aluminum A6063S-T5 Anodized (Customo-Made Color Available)

Model No. / Dimensions

□300 □450 □600
Model No. Standard Type White HHAS-303W★ HHAS-454W HHAS-606W
Silver HHAS-303★ HHAS-454★ HHAS-606★
Key Type White HHAS-K303W★ HHAS-K454W★ HHAS-K606W★
Silver HHAS-K303★ HHAS-K454★ HHAS-K606★
Dimensions Standard Dimensions 303×303 454×454 606×606
Ceiling Opening Dimensions 305×305 456×456 608×608
Inner Finishing Board Dimensions 293×293 444×444 596×596
Inner Backing Board Dimensions 257×257 408×408 560×560

* ★ is made-to-order. Please contact sales department about delivery date.
*Key type white’s decorative plate and cylinder part could not to be white color.


Hanging Wire

To prevent falling inner frame by hanging the wire to inner frame and channel. Use it with spring hook attaches to (rotating axis side) the hole of inner frame.

Custom-Made Color Available



Channel Catch

Use channel catch to attach.