Vetus Altus hatches come in three functional types — Escape, Deck, and Ventilation — each certified to CE Category AII with a dark smoke or opaque acrylic lens and a two-handle closure. The specification tables below give the exact external and cut-out dimensions (in inches and millimeters) for every Altus part number, so you can match a replacement hatch to your existing deck opening.
Vetus Altus hatches at a glance
| Type (model) | Purpose | Handles | Typical sizes (cut-out) |
|---|---|---|---|
| Escape (model 1) | Emergency egress / large deck opening | 2 | 518 x 450 mm up to 627 x 627 mm |
| Deck (model 2) | Access and light in the deck/coachroof | 2 | 417 mm round up to 507 x 377 mm |
| Ventilation (model 3) | Airflow in smaller openings | 2 | 260 x 260 mm up to 417 x 252 mm |
What are the Vetus Altus Escape hatch specifications?
Escape hatches (model 1) are the largest in the Altus range and are intended for emergency egress and generous deck openings. Every Escape model uses two handles.
| Part No. | External (in) | External (mm) | Cut-out (in) | Cut-out (mm) |
|---|---|---|---|---|
| ALT6363SL | 27 5/8 x 27 5/8 | 701 x 701 | 24 11/16 x 24 11/16 | 627 x 627 |
| ALT5151SL | 23 1/16 x 23 1/16 | 581 x 581 | 19 15/16 x 19 15/16 | 507 x 507 |
| ALT4747SL | 21 7/16 x 21 7/16 | 544 x 544 | 18 1/2 x 18 1/2 | 470 x 470 |
| ALTD520SL | 23 5/16 x 20 5/8 | 592 x 524 | 20 3/8 x 17 11/16 | 518 x 450 |
| ALTR529SL | 23 5/16 | 592 | 20 3/8 | 518 |
What are the Vetus Altus Deck hatch specifications?
Deck hatches (model 2) provide access and daylight through the deck or coachroof in mid-size openings, including a round option. All Deck models also use two handles.
| Part No. | External (in) | External (mm) | Cut-out (in) | Cut-out (mm) |
|---|---|---|---|---|
| ALT4242SL | 19 1/2 x 19 1/2 | 495 x 495 | 16 9/16 x 16 9/16 | 421 x 421 |
| ALT5038SL | 22 14/16 x 17 3/7 | 581 x 451 | 9 15/16 x 14 13/16 | 507 x 377 |
| ALT4633SL | 20 14/16 x 15 13/16 | 531 x 401 | 18 x 12 7/8 | 457 x 327 |
| ALTR420SL | 19 5/16 | 491 | 16 7/16 | 417 |
What are the Vetus Altus Ventilation hatch specifications?
Ventilation hatches (model 3) are the compact members of the range, sized for airflow through smaller openings while keeping the same two-handle closure.
| Part No. | External (in) | External (mm) | Cut-out (in) | Cut-out (mm) |
|---|---|---|---|---|
| ALT2626SL | 13 1/8 x 13 1/8 | 334 x 334 | 10 1/4 x 10 1/4 | 260 x 260 |
| ALTD420SL | 19 5/16 x 12 13/16 | 491 x 326 | 16 7/16 x 9 15/16 | 417 x 252 |
| ALA3502SL | 16 9/16 x 10 7/8 | 421 x 276 | 13 11/16 x 7 15/16 | 347 x 202 |
How do I choose the right Vetus Altus hatch size?
Match the hatch to your existing deck opening using the cut-out dimensions, not the external size — the cut-out is the hole in the deck, while the external figure is the finished frame footprint that sits on top. Then confirm the type: Escape for emergency egress and the largest openings, Deck for general access and light, and Ventilation for the smallest openings. Lens options include dark smoke acrylic (with aluminum frame) and opaque acrylic (with white frame).
Frequently asked questions
What is the difference between Escape, Deck, and Ventilation Altus hatches?
Escape hatches are the largest and are intended for emergency egress, Deck hatches serve mid-size access and daylight openings, and Ventilation hatches are the compact models sized for airflow. All three use a two-handle closure.
Should I use the external or cut-out dimensions when ordering?
Use the cut-out dimensions to match the opening in your deck. The external dimensions describe the finished frame that overlaps the surrounding deck.
What lens and frame options do Vetus Altus hatches offer?
Altus hatches are offered with a dark smoke acrylic lens on an aluminum frame, and select sizes are available with an opaque acrylic lens on a white frame.
Are Vetus Altus hatches certified?
Yes. Vetus Altus hatches are built to CE Category AII, the certification level indicated on the product listings for the Altus series.
How many handles do Altus hatches have?
Every Altus hatch across the Escape, Deck, and Ventilation ranges uses two handles.
Is there a round Altus hatch option?
Yes. The range includes round cut-out models, such as the ALTR420SL (417 mm) Deck hatch and round-format sizes in the Altus series.
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