Grand Ballroom 1-3 at Marriott Chicago O’Hare/Rosemont

Grand Ballroom 1-3 is 21.9 x 10.1 m (72 x 33 ft), 221 m² (2,381 sq ft), with a 3.7 m (12 ft) ceiling.

Plan view

LED wall that fits

Under a 3.7 m ceiling with 1.5 m trim and 0.3 m clearance you get 3 rows of 500 mm tile flown, which is tight; ground-stack or go lower on trim. Along the 21.9 m wall a Absen A2 Pro wall runs 35 x 3 (5880 x 504 px, 1,050 kg, 19.4 kW).

Wall sizing assumes 1.5 m trim to the bottom edge, 0.3 m clearance under the ceiling, and a wall no wider than 80% of the longest wall. Weight and power are tile totals from the panel spec sheet; add processing, rigging, and cable.

Seating estimate

After a 12 x 7 m stage, Grand Ballroom 1-3 holds about 304 theater seats, 124 banquet seats at rounds of 10, or 85 classroom seats. Back row in theater is roughly 14.9 m from the downstage edge; the previz checks whether the bottom of the wall clears the heads in front.

Other rooms at Marriott Chicago O’Hare/Rosemont

• Chicago Ballroom51.5 x 17.4 m (169 x 57 ft) · 3 m ceiling
• Grand Ballroom21.9 x 39.3 m (72 x 129 ft) · 5.5 m ceiling
• Grand Ballroom Pre-Function21.9 x 39.3 m (72 x 129 ft) · 3.7 m ceiling
• Grand Ballroom 1-429.3 x 21.9 m (96 x 72 ft) · 5.5 m ceiling
• O'Hare Ballroom23.5 x 25.3 m (77 x 83 ft) · 4.3 m ceiling
• O'Hare Pre-function Space23.5 x 25.3 m (77 x 83 ft) · 4.3 m ceiling
• Grand Ballroom 421.9 x 19.2 m (72 x 63 ft) · 5.5 m ceiling
• O'Hare Terminal 513.4 x 25.3 m (44 x 83 ft) · 4.3 m ceiling
• Chicago F+G17.4 x 17.1 m (57 x 56 ft) · 3 m ceiling
• Chicago A-C17.4 x 16.2 m (57 x 53 ft) · 3 m ceiling
• O'Hare Ballroom Terminal 1-325.3 x 10.1 m (83 x 33 ft) · 4.3 m ceiling
• Salons 8, 9 & 1010.4 x 21.9 m (34 x 72 ft) · 3.7 m ceiling

Published dimensions (source), fetched 2026-09-04. All rooms at Marriott Chicago O’Hare/Rosemont · Venues in Chicago