Dear Jeany,
The best option is to go for SF CROSS Bar Coller supplied by FLSmidth. The reasons are as follows:
1) Mechanical Air Flow Control
2) No moving Grates so, wear and tear will b be less. Easy replacement of Cross bars (they dont damage at all unless if operation is not done perfectly as per FLS standards)
3) Optimised Air disturbtion.
4) Reduce installation time and cost.
5) Reduction in power of coller fans.
6) Clinker conveying and air distrubtion are separate.
These SF cross bars are proved to be the best one.
Dear Jeany for any further doubts regarding you can mail me on madhu75nemani@gmail.com.
Regards,
Maddy