Vimutti Valley — Meditation Hall, Reflected Ceiling Plan

Vimutti Valley · World Dhammacakka Association · ceiling services: projection, lighting, air conditioning, sound, safety

Scale 1 : 100 | all dimensions in metres | revision 2, 31 August 2026 | companion sheet: floor plan

Revision 2 — coordinates follow floor-plan revision 6: stage 3.40 m deep, screen plane 3.50 m, projector at 7.50 m.

Read as a reflected ceiling plan: you are looking up, but left and right match the floor plan. North is at the top, as on the floor plan.

A proposal, not a specification. Everything on this sheet is an idea put forward for the project architect to work from. Every dimension, every position and every detail may be changed. What must survive is the intent behind it — and where a figure is fixed by law or by the turning circle of a vehicle, the sheet says so.

Recessed downlight, 12 W Adjustable spot / wall-wash AC cassette, 4-way Ceiling speaker Projector / motorised screen Access panel 600 × 600 Smoke detector Exit sign / emergency light

1 · Ceiling levels

Main hall ceiling

+ 4.20 m — flat plasterboard, painted matt, no coffers

Screen pocket

recess 0.25 m deep in the ceiling, 3.00 m long, on the centre-line at y = 3.50 m from the north wall

Store and AV room

+ 2.80 m — separate lower ceilings behind the rear partitions

Entry lobby

+ 4.20 m — continuous with the hall

Slab soffit

allow at least + 4.55 m so the pocket, the projector bracket and the duct runs fit above the finished ceiling

Matt ceiling, matt walls. This ceiling sits above a projection screen and a backlit image. Any gloss finish will bounce the projector light back onto the screen and flatten the picture. Paint the ceiling and the north wall in a matt, mid-to-dark neutral within 2 m of the screen if the image looks washed out on site.

2 · Projection — the geometry the ceiling has to hold

Item	Position / size	Notes
Motorised screen	casing 3.00 × 0.20 m at y = 3.50, centred x = 5.50	Tab-tensioned, matt white, gain 1.0. Picture 2.67 × 1.50 m (16:9, ≈120"), bottom edge +2.45, top edge +3.95. Recessed casing, closing fascia flush with the ceiling.
Screen access panel	0.60 × 0.60 at (7.90, 3.95)	Motor end. Must be reachable without dismantling the fascia.
Projector	lens at (5.50, 7.50), +3.85	Throw 4.00 m for a 2.67 m wide image — throw ratio 1.5. Inverted ceiling mount, bracketed to the slab, not to the suspended ceiling. Allow 3,500–5,000 lm for a room with dimmed but not blacked-out lighting.
Projector access panel	0.60 × 0.60 at (6.50, 7.50)	Filter and lamp/laser service, plus the cable loop.
Beam cone	apex (5.50, 7.50) to x 4.165–6.835 at y = 3.50	Keep the whole cone free of ceiling fittings. Nothing may hang into it: no pendant, no sprinkler drop, no speaker, no diffuser, no smoke detector.
Cable route	AV room → projector	Two conduits from the AV room along the east side, then across at y ≈ 7.50: one for HDMI / HDBaseT + control, one for power. Keep 300 mm from any lighting circuit.
Screen control	AV room + wall plate	Low-voltage relay so the screen drops when the projector is switched on, with a manual override at the AV room and a plate by the stage stair.

3 · Lighting schedule

Circuit	Fitting	Qty	Position	Control
L1	Adjustable spot, 15 W, 3000 K, 24° beam	5	y = 3.15, at x 1.60 / 3.60 / 5.50 / 7.40 / 9.40 — aimed north onto the monk row	Dimmable, own circuit
L2	Recessed downlight, 12 W, 3000 K	5	y = 2.45, at x 1.90 / 3.70 / 5.50 / 7.30 / 9.10 — general light on the deck	Dimmable, with L1
L3	Wall-wash, 10 W, 3000 K	4	y = 0.40, at x 1.60 / 3.60 / 7.40 / 9.40 — none on the centre-line, so the disc is not washed out	Dimmable
L4	LED cove behind the Ø2.50 disc	1 run	on the wall, behind the rim of the disc, which stands proud of the wall — not a ceiling item, shown for coordination	Dimmable, warm 2700 K, always on during sessions
L5	Recessed downlight, 12 W, 3000 K — hall front group	8	rows y = 5.20 and 6.90, at x 1.30 / 3.50 / 7.50 / 9.70	Separately switched so it can be killed during projection
L6	Recessed downlight, 12 W, 3000 K — hall rear group	10	rows y = 8.60 and 10.15, at x 1.30 / 3.50 / 5.50 / 7.50 / 9.70	Dimmable
L7	Recessed downlight — rear band, lobby, store, AV room	7	y = 11.50, at x 0.85 / 1.85 / 3.60 / 5.50 / 7.40 / 9.15 / 10.15	Switched at the lobby and at the AV room
L8	Exit sign + emergency luminaire	2	over the main door at (5.50, 12.15)	Unswitched, 3 h battery

Scenes

Scene	L1 monks	L2 deck	L3 wall	L4 niche	L5 front	L6 rear
Chanting	100%	60%	40%	100%	50%	50%
Teaching with projection	60%	30%	0%	30%	off	15%
Meditation	15%	0%	0%	40%	0%	5%
Cleaning	100%	100%	100%	100%	100%	100%

4 · Air conditioning

Item	Qty / size	Position	Notes
Ceiling cassette, 4-way, ≈3 TR each	4	(2.60, 5.90) · (8.40, 5.90) · (2.60, 9.50) · (8.40, 9.50)	≈12 TR total for 49 occupants — indicative, confirm by load calculation.
Clearance to the screen	≥ 2.00 m	nearest cassette is 2.40 m from the screen plane	A cassette any closer will make the screen billow. If the layout changes, keep this clearance.
Stage cooling	—	front pair, north vanes	No cassette directly over the monk row. The front pair throws north to reach the stage; a unit above the monks puts nine people in a draught for an hour.
Fresh air	1 duct	enters at the rear band, above the lobby	The hall has one door and solid side walls, so mechanical fresh air is not optional.
AV room extract	1 fan	(10.40, 12.20)	The amp rack makes heat in a sealed 5.6 m² room.

5 · Sound and safety

Item	Qty	Position	Notes
Ceiling speaker, 100 V line, 6 W tap	6	front pair in the end bays at x 0.45 / 10.55, y 1.90; then x 2.00 and 9.00 at y 6.70 and 10.05	Distributed array, off the centre-line and clear of the beam cone. Even coverage at low volume is what a meditation hall needs — not a loud front pair.
Microphone floor boxes	3	in the stage deck at x 2.50 / 5.50 / 8.50, y 2.80	Not a ceiling item — listed so the deck build-up allows for the conduit.
Smoke detector	2	(3.20, 5.50) and (7.80, 9.30)	Clear of the cassette air streams and of the beam cone.
Exit sign + emergency light	2	(5.50, 12.15)	Over the only external door.

6 · Ceiling section

7 · Coordination — what must not clash

Everything below is a hard constraint. If any of it is broken on site, the room stops working in a way that cannot be fixed afterwards without re-cutting the ceiling.

Nothing inside the projector beam cone. The cone runs from the lens at (5.50, 7.20) to the full width of the picture at y = 3.50. Two downlight positions on the centre-line — (5.50, 5.20) and (5.50, 6.90) — are deliberately omitted for this reason; the grid is otherwise complete.
The projector bracket goes to the slab, not to the suspended ceiling grid. A projector that moves 2 mm puts the picture off the screen.
Keep AC cassettes 2.00 m clear of the screen. Air across a tensioned screen makes it ripple, and the ripple shows in every straight line on the slide.
No cassette over the monk row. Nine people sit still for an hour under whatever is above them.
The niche cove and the screen are on different walls of the same problem. When the screen is down it covers the image; the cove must therefore be on its own dimmable circuit so it can be taken to 30% rather than switched off, keeping some presence behind the screen.
The 112 kg image bracket is a structural item, fixed to RC or to purpose-built backing — see the floor plan sheet. It is set before the ceiling and the cove are built, not after.
Keep the L1 spots off the storage-chest lids. The lids open forward into the walkway behind the monks; a spot aimed steeply down at y = 3.15 will throw the open lid's shadow across the monk row. Aim the spots at the seated figures, not at the deck behind them.
Two access panels are mandatory — screen motor and projector. Both 600 × 600, both reachable from a stepladder without moving furniture.
Slab soffit at +4.55 m or higher. Finished ceiling 4.20, pocket 0.25, plus the projector bracket and duct crossings above.