filter_x = 368; // mm
filter_y = 494; // mm
filter_z = 44; // mm

module filter() {
  // https://airfiltration.ca/collections/pleated-merv-plus/products/merv-13-2inch?variant=19413155348547
  // merv-13 15x20x2
  cube([filter_x, filter_y, filter_z]); 
};

fan_box_x = 255; // mm
fan_box_y = 130; // mm
fan_box_z = 43; // mm
module fan_box() {
  cube([fan_box_x, fan_box_y, fan_box_z]);
};

fan_mounting_hole_radius = 3; // mm
fan_mounting_hole_length = 56; // mm

module fan_plate_mounting_hole() {
    // 56 mm length, which is 50mm between circle centers
    hull() {
        circle(fan_mounting_hole_radius, $fn=360);
        translate([fan_mounting_hole_length - 2*fan_mounting_hole_radius, 0, 0]) {
            circle(fan_mounting_hole_radius, $fn=360);
        }
    };
}

fan_plate_x = 353; // mm
fan_plate_y = 229; // mm 
fan_plate_z = 1; // mm
module fan_plate() {
    linear_extrude(fan_plate_z) {
        difference() {
            offset(r=1, $fn=360) {
                // 353x229 but reduced for offset
            square([fan_plate_x-1, fan_plate_y-1]);
            }
            
     // @TOOD: Fix the translation values
     translate([10, 10, 0]) {  rotate([0, 0, 45]) {                 fan_plate_mounting_hole();
     }; };
     translate([10, 218, 0]) {  rotate([0, 0, -45]) {                 fan_plate_mounting_hole();
     }; };
     
     
     translate([310, 180, 0]) {  rotate([0, 0, 45]) {                 fan_plate_mounting_hole();
     }; };
     translate([300, 50, 0]) {  rotate([0, 0, -45]) {                 fan_plate_mounting_hole();
     }; };
     };
     
    };
};

fan_cable_spacing = 30; //mm
fan_box_offset_x = 48; // mm
fan_box_offset_y = 50; // mm
fan_box_offset_z = 1; // mm
module fan() {
   // https://acinfinity.com/hvac-home-ventilation/exhaust-fans/crawlspace-basement-fans/airtitan-s7-crawlspace-fan-with-speed-controller-12-inch/
   // AirTitan S7 crawlspace fan
   union() {
     translate([fan_box_offset_x, fan_box_offset_y, fan_box_offset_z]) {
       fan_box();
     };
     fan_plate();
   }; 
};


side_wall_x =  5; // mm
side_wall_y =  fan_box_y + 2*filter_z + 2*fan_cable_spacing;
echo("Side wall:", side_wall_y, "by", side_wall_z);
side_wall_z = filter_y; // mm
module side_wall() {
    // from rona
    cube([side_wall_x, side_wall_y, side_wall_z], center=false);
}

#fan();

// leave 30mm for the power cable gland
// that comes off the fan_box
translate([-(filter_x - fan_plate_x)/2, filter_z - fan_cable_spacing , fan_plate_z]) {
rotate([90, 0, 0]) {
#filter();
}};

// leave 30mm for the power glang
// that comes off the fan_box
translate([-(filter_x - fan_plate_x)/2, fan_plate_y + fan_cable_spacing, fan_plate_z]) {
rotate([90, 0, 0]) {
#filter();
}};

translate([-2, -20, fan_plate_z]) {
#side_wall();};
translate([filter_x, -20, fan_plate_z]) {
#side_wall();};