Beyma 18P1000Fe box port size help

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Im looking at making a vented square box for a Beyma 18P1000Fe and would only have 109lt - 120lt in space but im really stuck on the port size . 
  Can any of help . 

here are the specs of the driver:

Technical specifications:

Nominal diameter - 460 mm. 18 in.
 Rated impedance - 8 ohms
 Minimum impedance - 6.2 ohms
 Power capacity* - 1000 w AES
 Program power - 2000 w
 Sensitivity - 98 dB 2.83v @ 1m @ 2p
 Frequency range - 25 - 2000 Hz
 Recom. enclosure vol. - 80 / 200 l 2.8 / 7 ft.3
 Voice coil diameter - 100 mm. 4 in.
 Magnetic assembly weight - 10.8 kg. 23.76 lb.
 BL factor - 26 N / A
 Moving mass - 0.215 kg.
 Voice coil length - 21 mm
 Air gap height - 12 mm
 X damage (peak to peak) - 52 mm

Thiele-Small parameters**

Resonant frequency, fs - 40 Hz
 D.C. Voice coil resistance, Re - 5.1 ohms
 Mechanical Quality Factor, Qms - 15.11
 Electrical Quality Factor, Qes - 0.40
 Total Quality Factor, Qts - 0.39
 Equivalent Air Volume to Cms, Vas - 163.2 l
 Mechanical Compliance, Cms - 75 mm / N
 Mechanical Resistance, Rms - 3.61 kg / s
 Efficiency, ho (%) - 2.5
 Effective Surface Area, Sd (m2) - 0.1250 m2
 Maximum Displacement, Xmax*** - 8 mm
 Displacement Volume, Vd - 1000 cm3
 Voice Coil Inductance, Le @ 1 kHz - 2.8 mH

Mounting Information

Overall diameter - 462 mm. 18.19 in.
 Bolt circle diameter - 438 mm. 17.24 in.
 Baffle cutout diameter: - 
 - Front mount - 413 mm. 16.26 in.
 - Rear mount - 400 mm. 15.75 in.
 Depth - 203 mm. 7.99 in.
 Volume displaced by driver - 13 l 0.46 ft.3
 Net weight - 12.9 kg. 28.38 lb.
 Shipping weight - 14.4 kg. 31.68 lb.

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BOOMBOOMPOW Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 22 June 2011 Location: NORTH Status: Offline Points: 335	Post Options Post Reply Quote BOOMBOOMPOW Report Post Thanks(0) Quote Reply Topic: Beyma 18P1000Fe box port size help Posted: 14 July 2016 at 11:04am
	Im looking at making a vented square box for a Beyma 18P1000Fe and would only have 109lt - 120lt in space but im really stuck on the port size . Can any of help . here are the specs of the driver: Technical specifications: Nominal diameter - 460 mm. 18 in. Rated impedance - 8 ohms Minimum impedance - 6.2 ohms Power capacity* - 1000 w AES Program power - 2000 w Sensitivity - 98 dB 2.83v @ 1m @ 2p Frequency range - 25 - 2000 Hz Recom. enclosure vol. - 80 / 200 l 2.8 / 7 ft.3 Voice coil diameter - 100 mm. 4 in. Magnetic assembly weight - 10.8 kg. 23.76 lb. BL factor - 26 N / A Moving mass - 0.215 kg. Voice coil length - 21 mm Air gap height - 12 mm X damage (peak to peak) - 52 mm Thiele-Small parameters Resonant frequency, fs - 40 Hz D.C. Voice coil resistance, Re - 5.1 ohms Mechanical Quality Factor, Qms - 15.11 Electrical Quality Factor, Qes - 0.40 Total Quality Factor, Qts - 0.39 Equivalent Air Volume to Cms, Vas - 163.2 l Mechanical Compliance, Cms - 75 mm / N Mechanical Resistance, Rms - 3.61 kg / s Efficiency, ho (%) - 2.5 Effective Surface Area, Sd (m2) - 0.1250 m2 Maximum Displacement, Xmax* - 8 mm Displacement Volume, Vd - 1000 cm3 Voice Coil Inductance, Le @ 1 kHz - 2.8 mH Mounting Information Overall diameter - 462 mm. 18.19 in. Bolt circle diameter - 438 mm. 17.24 in. Baffle cutout diameter: - - Front mount - 413 mm. 16.26 in. - Rear mount - 400 mm. 15.75 in. Depth - 203 mm. 7.99 in. Volume displaced by driver - 13 l 0.46 ft.3 Net weight - 12.9 kg. 28.38 lb. Shipping weight - 14.4 kg. 31.68 lb.
	Its sounds Great