Help with filtering code

I would like to exclude some items from showing on a search results page.

This page: 

http://www.axislighting.com/CMS/search_products.php

It uses the file I uploaded to make the search products refine the search which filters search results based on item mounting, distribution and lamping categories

Here is the script from the search_products_results4.php page:

<?php

  /* STEP 1: LOAD RECORDS - Copy this PHP code block near the TOP of your page */
  require_once "../cmsAdmin/lib/viewer_functions.php";

$where = "num=num";

if((@$_REQUEST['mounting'] != "undefined") && (@$_REQUEST['mounting']) ) {
   $where .= " AND mounting LIKE '%" . mysql_real_escape_string($_REQUEST['mounting']) . "%' ";
}
if((@$_REQUEST['distribution'] != "undefined") && (@$_REQUEST['distribution']) ) {
   $where .= " AND distribution LIKE '%\t" . mysql_real_escape_string($_REQUEST['distribution']) . "\t%' ";
}
if((@$_REQUEST['lamping'] != "undefined") && (@$_REQUEST['lamping']) ) {
   $where .= " AND lamping LIKE '%" . mysql_real_escape_string($_REQUEST['lamping']) . "%' ";
}







  list($itemsRecords, $itemsMetaData) = getRecords(array(
    'tableName'   => 'items',
    'debugSql' => false,
    'where' => $where,
    'allowSearch'        => false,
  ));
 
  
?>

Problem is that I also want to hide some items from showing in the first place, where do I add this code that it should not interfere with the search results. 

'where' => "hide_from_search_page != '1'" ,

I made a checkbox in the section editor, which says hide from search page, when I add it to to the other where line below, it hides the product, but the refine search does not work.

'where' => $where && "hide_from_search_page != '1'" ,